Probably still Sp or Ud
if you like aggressive play, UD can be your way. If you like more balanced stuff, i would say FS at the moment is the cheapest to make a competitive balanced BG.
But isn't UD expensive, like FW?
ST is relatively easy and very OP. UD is too weak to be enjoyable.
ud is not weak, is less versatile so it can be more frustrating.
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