Turned down a FAANG onsite to finish a startup process I was already three rounds into, still not sure I made the right call

The FAANG recruiter reached out mid-process with the startup and wanted to move fast, but I'd already put in real time with the startup team and liked the people I'd be working with. Said no to the onsite, which felt strange to type out loud even to myself. Startup offer came through a week later and I took it. No regrets exactly, but I do wonder sometimes what the onsite would've told me about my own ceiling.