Below you will find all the perks listed with the benefits they give and any additional Warzone benefits, if they have.
You get to pick 3 Perks, 1 from each category, there is no right or wrong Combination, it all depends on your personal Play style.
For example if you like hunting players down then TRACKER perk is a good choice, but if you like to camp (sorry I mean defend) buildings, then it doesn't have any use.
My personal favourites are:-
Perk 1: Cold Blooded
Perk 2: Ghost Perk
Perk 3: Shrapnel in Multiplayer or Battle Hardened in WarZone
Because im an aggresive player and hunt down the weak, so this is easier if they dont know im comeing lol.