Short answer: there’s no single winner for every use — but in Saudi Arabia (especially Riyadh and Jeddah) two patterns stand out:

• For ultra‑fast food delivery: Keeta (Meituan’s entrant) and local quick‑delivery players like Ninja/HungerStation often report the fastest on‑average food deliveries; Keeta’s Q1 2025 data even highlighted sub‑minute fastest records in its network. (SaudiGazette.com.sa)

• For fastest grocery/quick‑commerce (items to your door in ~20 minutes): Careem Market (Careem NOW/Careem Market) and dedicated quick‑commerce grocers (Nana, Noon, some local dark‑store services) explicitly advertise 15–30 minute delivery windows in major Saudi neighbourhoods. (fwdstart.me)

A few practical notes:

• Speed varies a lot by city, neighbourhood, time of day and restaurant/warehouse proximity — an app that’s fastest in central Riyadh may be slower in a smaller city.
• Market rankings and offerings change quickly; Sensor Tower and other app‑analytics outlets show the landscape shifting through 2024–2025. If you want a precise, up‑to‑date check for your exact neighbourhood, I can look up current advertised delivery times and coverage for the apps available where you are. (sensortower.com)

If you tell me the city/neighbourhood and whether you mean food or groceries, I can fetch live comparisons for the fastest app there.