Very Simple Question To You, But It Must Be Asked Every Now And Then...
Your favorite Perk?
The only rule is: It can't be an older version, for example Save The Best For Last's simple reductions to both attack animations is a no no.
Reason why it is your favorite doesn't matter at all, but it'd be great if you said why it is.
Can be from either role, can be any Perk level.
Heck, you don't even have to be the one using your favorite to make it your favorite: For example, if you really like Kindred because of others using it so much (in your trials), then it can be your favorite.