Below is a concise, practical comparison of the major B2B technology review platforms — who uses them, how they gather and present reviews, strengths/weaknesses, typical vendor features, and which to use for common buyer/vendor goals.

Platforms covered: G2, Gartner Peer Insights, TrustRadius, Capterra / GetApp / Software Advice (Gartner Digital Markets family).

1. G2

• Audience & scale: Very broad B2B software marketplace with very large review volume and high consumer-facing search visibility (millions of reviews, extensive category coverage). (learn.g2.com)
• Review model & verification: Public reviewer submissions with moderation/verification; features to boost review collection (incentives, integrations, APIs). (g2.com)
• Key features: Powerful search/filters, buyer recommendation engine, product comparison pages, analytics/dashboards, review syndication and vendor marketing products. (g2.com)
• Strengths: Very high review volume (good for mainstream and many niche products), strong SEO/visibility, extensive buyer-intent data and vendor marketing tools.
• Weaknesses: Paid vendor programs can influence placement/visibility; quality of reviews is mixed because of volume; enterprise buyers sometimes prefer analyst-verified channels.
• Best for: Buyers doing broad market discovery and rapid shortlisting; vendors seeking maximum visibility, leads, and analytics.

2. Gartner Peer Insights

• Audience & scale: Enterprise-focused — technology decision-makers (directors/CxOs) and IT practitioners; used by Gartner analysts as one input to research. Peer Insights emphasizes verified enterprise reviews. (gpivendorresources.Gartner.com)
• Review model & verification: Strict verification of enterprise reviewers and vendor-free community rules; reviews are positioned as peer (IT leader) feedback. (gpivendorresources.Gartner.com)
• Key features: Vendor-free community, curated analyst linkages (Peer Insights can feed into Magic Quadrant/analyst work), enterprise-grade reporting.
• Strengths: High trust with enterprise buyers, vetted reviewers, useful when looking for large-scale/complex deployment feedback.
• Weaknesses: Smaller review counts for some categories; less consumer-facing SEO/volume than G2.
• Best for: Enterprise procurement and technical evaluation where reviewer credentials and enterprise deployment detail matter.

3. TrustRadius

• Audience & scale: Buyers who want in-depth, long-form, verified reviews. TrustRadius emphasizes quality over raw volume and positions itself as “buyer-intent / trusted” review site. (b2bsaasreviews.com)
• Review model & verification: Strong verification process (work email/LinkedIn), often longer reviews with structured Q&A prompts; historically touts no paid ads/sponsored ranking. (b2bsaasreviews.com)
• Key features: Long-form reviews, ROI/use-case detail, TrustMaps and research-style signals, buyer-intent analytics for vendors.
• Strengths: Depth and quality of review content — better for nuanced comparison, ROI and real-world usage details. Perceived high credibility.
• Weaknesses: Lower review volume for niche products; UI/navigation can be less streamlined; some categories have limited sample size. (Capterra.com)
• Best for: Technical buyers who need detailed deployment/use-case feedback and vendors who want to surface in-depth customer stories.

4. Capterra / GetApp / Software Advice (Gartner Digital Markets)

• Audience & scale: Strong SMB focus and buyer-intent discovery; collectively target small-to-mid market buyers and are widely used for category leader lists and badges. Vendors often get badges (FrontRunners, Shortlists) that help discoverability. (globenewswire.com)
• Review model & verification: Public reviews with platform moderation; these sites also combine analyst-style lists (FrontRunners/Shortlist/Category Leaders).
• Key features: Category leader reports, easy comparison for SMB buyers, lead generation and contact/ad products for vendors.
• Strengths: Great for SMB evaluation, high discoverability among small/medium buyers, straightforward comparison tools.
• Weaknesses: Less depth than TrustRadius; perceived as more marketing/lead-gen oriented (because of vendor paid placements and badge programs).
• Best for: SMB buyers and vendors focused on small/medium business market expansion.

How they differ on a few critical axes

• Verification & reviewer credentials: Gartner Peer Insights and TrustRadius emphasize strict verification and enterprise credentials; G2 and the Gartner Digital Markets sites verify but have larger-volume, more mixed audiences. (gpivendorresources.Gartner.com)
• Review volume & breadth: G2 >> Capterra/GetApp ≈ Software Advice >> TrustRadius (by depth vs. volume) >> Peer Insights (smaller but enterprise-weighted). (learn.g2.com)
• Vendor influence / paid placement: G2 and Gartner Digital Markets offer extensive vendor marketing/paid features; TrustRadius historically emphasizes less paid placement; Peer Insights enforces vendor-free community rules but still offers vendor portals for analytics. (g2.com)
• Best trust signal for enterprise procurement: Gartner Peer Insights, followed by TrustRadius (long-form, verified) — because reviewer credentials and in-depth content matter more than sheer volume. (gpivendorresources.Gartner.com)

Practical recommendations (quick)

• If you need rapid market coverage and SEO/lead volume: prioritize G2 (use it for visibility and broad buyer reach). (learn.g2.com)
• If you’re evaluating enterprise-grade software and need vetted, technical peer feedback: use Gartner Peer Insights. (gpivendorresources.Gartner.com)
• If you want deep, long-form user experiences (ROI, implementation lessons): read TrustRadius reviews. (b2bsaasreviews.com)
• If you sell to SMBs or want category badges/FrontRunners exposure: use Capterra / GetApp / Software Advice. (globenewswire.com)

If you want, I can:

• Produce a short decision flow (2–3 questions) to pick the single best site to prioritize for either vendor marketing or buyer research; or
• Create a one-page checklist for collecting and validating reviews across these platforms (what info to capture from reviewers, what to require for verification, which platform fields to optimize).