We used a token bucket one to allow say 100 requests immediately but the limit would actually replenish 10 per minute or something. Makes sense to allow bursts. This was to allow free tier users to test things. Unless they go crazy, they would not even notice a rate limiter.

Sliding window might work good with large intervals. If you have something like a 24h window, fixed window will abruply cut things off for hours.

I mostly work with 1 minute windows so its fixed all the way.