arena for slaves and main

I want to make some 2v2 arena with my main

I got 1200 resi , 2400sp, very low on haste! , and 24k hp unbuffed.

want to make some 2v2, should i go for elemental or resto? coz of i dont got haste trinkets and stuff what u suggest me maybe resto?

should i spend my arena poıints to buy 3 pcs of healing gear (relentless) and mix it with my current elemental gear and play as healer? or should i buy haste trinket with triumps and invest my points to elemental gear to upgrade my furious to relentless?

coz im not a pro elemental also :)

so should i spent my points for heal gear for +100 resi or upgrade elemental stuff?