Since I started playing bruisers, I found that I was dominating early game, falling off a bit but still strong midgame, but once team fights started I ended up dying in seconds, after doing barely any damage. Since then I decided I was building for too much damage and wasn't tanky enough. After deciding to build more tanky items like Wits End, Atma's and Warmogs, I have found myself surviving team fights with a much higher success rate since I could actually survive being focused for a few seconds.
My question is, what is the right way to build AD Bruisers for late game against; high Attack Damage opposition, or against high Ability Power opposition. I understand that this changes from champion to champion, game to game but I just want a standard build against heavy incoming AD damage, and one for heavy incoming AP damage. Any insight provided would be great. Thanks!