Weirdly I found it depends on the bike. My big bike had a 150mm post now, before that, it had a 125mm KS and it never felt enough, I often dropped it in the frame for more difficult descents.
But that 125mm KS is in my hardtail now and is absolutely fine- and I ride all the same stuff on both bikes.
But more is more, generally. Seems to me there’s absolutely no drawback to having more drop than you need but there is to having less drop than you want. As long as it fits in the frame anyway, quite a lot of modern bikes seem to be going with absurdly long seattowers that limit the fitting/dropping of posts.
Oh and KS>Reverb IMO- I replaced my KS with a Reverb Stealth and it was a mistake 🙁 The Lev was more expensive but I wish I’d paid the extra for the better product. Reverb lever is shite 🙁