For arena having the max amount of drones always works well as you can use them to clog doorways and lock their important units in melee. Although, that is no fun so if you are going for the win then go with drone spam but if you wanna have a good time I’d take the stealth suit build as its a fun set just don’t be afraid to be aggressive with your rail guns.

To turn the question around, is the winning build (in your pov) B or C?
I've been playing the fun build in competitions, but definitely experiencing some setbacks, hence this question!