affliction is asome both pvp and questing you never have to drink
and you can take on 3 people at ones pretty easy but however you spend allot of time waiting for dots to go off and renew them but thing about this is that crit rating is pretty much wasted you only need spell hit rating and spell damage so you gonna miss out on the big crits

destruction is the oposit of aff you can drain your mana realy quick so gonna spend allot of gold on water the crits are the best thing with this spec but you are going to have problem with mele guys if they are aiming for you so death coil, fear, sedus or shadowfury stun is the best hope to get away destruction does way more damage then aff

il toke aff spec cause you can pretty easy escape bad situations and no drinking is realy needed and this is realy helpful on instances like black moras wher you dont realy have anytime at al to drink