for stats,
int increases hit, crit, mana and mana regen
dex increases hit, crit, dodge and armor
however both will increase your base damage and dps, but dex still has more impact than int or str

in my opinion
dex still does a lot for mage especially if you wish to have more damage
I've tested both stats with full int and int/dex (without equipping gears and weapon)
to be honest, I just see slightly differences between int and int/dex
that says, weapons and gears still have most impact than your stats, which I think rebalance still not completed
that's why people are still looking for top gears

for you, as a low level mage
I will say it doesn't matter you do with pure int or int/dex because system might change when you reach level cap
unless you want to play pvp

str mage, I wouldn't do that if I were you just my opinion