Basic Attack build
The Basic Attack build is about landing basic attacks. this build does alright in all aspects not excelling in anything. It generally requires you to stay alive for a long period of time and to land basic attacks consistently. This build has solid long term self sustain but struggles to have massive bursts of sustain. It works well with Raynor, Morales and Abathur.

Body Check Build
The Body Check Build is a fairly tanky build that also allows you to soft cc your opponent consistently while reducing the healing they receive. It works especially well against teams with pocket healers or when you or an opponent is trying to escape.

Wrecking Ball Build
The Wrecking Ball build makes use of the ability Wrecking Ball to move enemies and allies around the battlefield. It works to set up combos and also allows your team to dive with the talent Into the Fray. It is easily the best build while chasing and also can cc your opponent effectively. I recommend this if you have Artanis,Illidan,Alarak or The Butcher.

Groundbreaker Build
The Groundbreaker Build is based on the idea that your team is gonna initiate with Groundbreaker. It gives you some instant survivability at level 13 and slows your opponent at 16 which can be decisive in fights. It works especially well against compositions that are based on auto attacking. Either heroic works in this build. If you a struggling to land the pull on Groundbreaker practice in the Test realm

Bloodthirst build
The Bloodthirst build is the best build for pushing and generally is also the best if Garrosh somehow isn't the main tank.(Which should almost never happen) It allows for solid single target damage as well. Any level seven talent works generally pick based on the opposing team comp or your team comp.

I haven't found the best build for a wombo combo build yet but I am working on it.