Most Useful Arena Skill

I'm trying to figure out which 6*s to buy to build up my GW team, so I thought to ask your opinions on which arena skills you think are the best.
Also, which would you consider as more important when choosing a unit - arena skill or stats?

Iron wall seems to be in high demand, from what I can see. How about the others?

Thanks in advance for the advice! ^_^

ironwall is great... IF u get a whole 5 man ironwall unit for defense.... one only wouldnt suffice..
imo, incinerate, speed order and crit shot are great...
but gw isnt only about skills, hp and speed also counts

i personally think drain atk is great for free player. esp arana, and she's a great tank with b speed =)

i also heard incinerate, also good do a pretty good damage every turn. :O but i never tested my self. (Allies said so tho, and 3-4 my allies)

defense order!!! It raises your def! quite much~~!!!! However I think 6-7* Units of this skill cost a lot, so maybe try rin or corda?

i tried stone breath i think it's not bad too.. however they're all d speed..

but then I would rather get tank+ decent speed and atk instead of concerning too much abt arena skill

you have to decide what position you will going to take

offense position built will have huge difference from defense position built.