Angel in AtS 5 is peak Angel. It's like, finally we get why both the PtB and the dark powers want this guy on their side during an apocalypse. They don't want Angelus, or nihilistic Angel, or dork Angel, they want the version that even when he's surrounded on all side by enemies will nonetheless do what it takes to lead fellow champions and outsmart/defeat the bad guys.
I also like S1 Angel as well and the journey he goes on, discovering his mission and finding his place in the world; being a guy others can count on.
Worst version of Angel; S3 Angel, dorky Dad/Cangel cretin that he was. Only improves, belatedly, when he's fighting for his son (either baby or teen Connor) but even then he gets outsmarted and loses.