I’m a huge fan of everything from Trespass up through Wind and Wuthering.
Everything after that is pretty bad, or worse, IMO.
It is also my opinion that they lost a lot more, musically speaking, when Steve Hackett left the band, than when Gabriel left the band.
For me, it is not the Gabriel era vs the Collins era. It is the Philips/Hackett era vs the post Hackett era.
Hackett and Philips both did solo albums that are much better that any Genesis album of the post hackett era.
My favorite albums are, SEbtP and The Lamb.