DEX affects much more than just evasion and it is not suggested for tanks as a way to boost evasion. If I remember right, it affects your block rate among other things, so higher dex= more shield blocks.
Could remember wrong too tho, a bit old subject for me, covered in spider webs and all already.
Forget about evasion, low base dex, -6 evasion from majesty, -8 evasion from shield and no evasion passives, it's totally useless for human tanks (unless you are pulling trains to power level someone on ~40 levels lower mobs). I'm gonna take a guess that you are still leveling up your paladin, if so maximize damage output. Get both +str and +dex and focus sword even if you get clan/friends groups all the time, just use some hp weapon for tanking raids and you'll be fine. I wouldn't do -str +dex +con build unless you are lv 77+.
Forget about evasion, low base dex, -6 evasion from majesty, -8 evasion from shield and no evasion passives, it's totally useless for human tanks (unless you are pulling trains to power level someone on ~40 levels lower mobs). I'm gonna take a guess that you are still leveling up your paladin, if so maximize damage output. Get both +str and +dex and focus sword even if you get clan/friends groups all the time, just use some hp weapon for tanking raids and you'll be fine. I wouldn't do -str +dex +con build unless you are lv 77+.
QFT
As I have siad before in another DA thread, do not listen to peope that tell you not to get a +4 dex tat. Your attack speed and crit rate are much more beneficial than the +4 str.
+DEX = more attack speed, more shield block, more critical attacks, more running speed...
+CON = more hit in your face without dying, more breath, more weight, less stun
-STR = less damage... But DA are already so weak that it won't really do the difference !