SEBTP (hate the Battle of Epping Forest) & Nursery Cryme are their best.
When Gabriel split the "Real" Genesis fans followed his solo career. The Collins era was pop, and seen as a sellout, his only saving grace was Wind & Wuthering.
Hated Collins' solo albums at the time but I can appreciate them now for their excellent production.
Fair play though Gabriel's first few albums bankrupted him because they were critical (Solsbury Hill), but not commercial successes. Collins et al helped him out big time.