So for PVP matches (medium and long) you want your stats as follow
Speed in B - 700 to 1200 speed is negligible difference
Stamina in A - guarantees you wont run out of stamina even without blue skills
Power in S - to make sure you can get through the crowd
Guts in E - in case red skills get triggered against you
Wits in D - 70% skill activation is more than enough

With this you will never lose PVP matches again.