Here are several of Singapore’s most exclusive hotels that are repeatedly praised for signature, highly personalized service — with the specific service or experience each is best known for.

1. Raffles Singapore — legendary colonial icon known for award‑winning, old‑world personalised service and 24‑hour butler service; famous for its Long Bar and the Singapore Sling. (sg.trip.com)

2. Capella Singapore (Sentosa) — secluded luxury resort offering villa‑style accommodation, highly tailored guest programmes and dedicated butler/personal‑assistant service in a tropical garden setting. (scribd.com)

3. Marina Bay Sands — signature spectacle service for VIPs and suite guests (24‑hour butler for top suites), integrated resort experiences (celebrity chef restaurants, world‑famous rooftop infinity pool) and large‑scale bespoke event hospitality. (theweek.com)

4. The St. Regis Singapore — classic St. Regis butler service (personalized packing/unpacking, pressing, shoe‑polishing, bespoke turn‑down) combined with refined, residential service in Orchard Road’s luxury district. (ipremium.mc)

5. The Ritz‑Carlton, Millenia Singapore — noted for attentive, art‑informed hospitality, spacious bay‑view rooms and highly regarded concierge and event services for discerning travelers. (ipremium.mc)

6. The Fullerton Bay Hotel Singapore — intimate waterfront hotel known for polished, discreet service, skyline views, private chauffeurs/concierge arrangements and a refined, romantic atmosphere. (ipremium.mc)

7. Crockfords / Resorts World Sentosa (Crockfords Tower) — an all‑suite, casino‑adjacent property on Sentosa that emphasizes opulent, white‑glove service including dedicated butlers and VIP hospitality. (scribd.com)

Notes on choosing:

• If “signature service” for you means a personal butler/24‑hour in‑suite attention, look to Raffles, St. Regis, Capella and top suites at Marina Bay Sands. (sg.trip.com)
• If you prefer a quieter, resort‑style private experience (gardens/villas + very personalized programming), Capella on Sentosa is a standout. (scribd.com)
• For iconic, large‑scale luxury with extensive on‑site experiences (dining, shopping, events), Marina Bay Sands leads. (theweek.com)

If you’d like, I can:

• Narrow these to a shortlist based on your travel dates, budget, or preferred neighborhood (Marina Bay, Orchard, Sentosa, Civic District), or
• Compare suite‑level inclusions (butler service, airport transfer, in‑room treatments) for any two or three hotels you choose.