100W will probably not be sufficient to gig seriously, at least with a live drummer, for many (most) styles. Bear in mind that all else being equal*, a 100W amp is about 6db louder at max volume then a 25W amp - less than twice as loud, and about 1.5x a 40W amp.
Which also means it’s fine for home, just turn it down a bit, as Pam says.
And conversely a 25W amp is also fine for home - it’s more than half the max volume of a 100W amp
Now for jam sessions and rehearsals on the other hand - 100W would be perfect.
(* it’s a little more complicated than just the power; the 100W amp will also have a larger speaker than the 25W or 40W as well, and this will probably add 2-3db as well due to speaker efficiency. So the 25W amp will probably end up being ~half the perceived volume of the 100W, and the 40W ~2/3 the volume of the 100W. @DaveT has a great thread about this somewhere.)