should i go ferl or resto?

to level feral
to pvp resto
to do pretty well at both balance

resto is too slow for serious leveling but it is doable if you have the patience

Feral is the best because there is basically no down time

balance is great for pvp but for leveling there is quite a bit of down time.

What is it about resto that makes it so excellent for PvP?  Aren't you likely to run out of mana before you get your opponent killed off?