go for tasgall's. the physical mitigation is nice to have on both, but you get more out of tasgall's.
for you to be in DPS, might then vit would be the choice. you take less enemies at once killing them faster.
as for the tanking part, traiting blue and all, you would want to go vit then might, you could take more enemies at once and take your time with them.
up to 65ish, the gear is not as distinct as it gets past 65. traits do much more of a diffenece in how you play. might/vit are both important for you, and whether you go for one or another doesn't make that much of a difference while leveling up.
I would suggest tanking traits for leveling. This way you can mop up huge amount of mobs with each pull and it will not be slower that taking 2 - 5, getting out of combat. The longer you stay in combat the more benefits you will get from all the buffs. As pockets items go, the best one to use is +XP one, as the difference from others will be very small.
Now and then: R9 spdr R9 rvr R9 wrd R6LM R6 BA R5 BA R5 dfl R6 WL R 6 wrg R6 grd R6 hnt R7 cpt R6 mns