.com is obviously the preferred choice, but from my perspective these are the next best picks:
- .io for B2B, SAAS, etc. startups. Occasionally makes sense for B2C (itch.io, etc.) Seems to be falling out of fashion, though.
- .ai is the top choice for ML-based startups. These are really hot now.
- .dev for the occasional SAAS or library. Doesn't make sense B2C.
- .app if you're linking to a mobile app or have a SPA-like functionality. Not super popular, though.
AFAIK, the other TLDs seem like spam/noise. That might just be personal perception and I could be totally wrong. Am I missing anything?