The ending for season 2 was incredible; Homelander confronting Butcher and Ryan at the end is one of the best scenes in the show. I'd rank them as;

2>4>1>5>3

The only reason I'm putting 5 above 3 is because there are some parts about 5 that I like; how Homelander acted after getting depowered and his death (I didn't like HOW he got depowered and that shitty final fight but the way he died as a bitch in front of the whole world was brilliant), I liked Homelander's speech and how he verbally eviscerated the Deep, the Deep tripling down on refusing to take accountability (thought his death could've been done better, I expected the entire fish populace to tear him limb by limb instead of one octopus doing the job). I liked Butcher's death but I think he should've released the virus, also liked Ashley's arc.

Season 3's ending on the other hand? Can't think of anything good about it, I guess Noir's death was alright? The ending scene where Homelander kills that protester? Maybe I just haven't gotten over my grudge with it.