that's a good question, do you own a good shanty? if so i would get the auger. But if you don't have a good shanty, then i would buy the suit.
I think the 6" lazer would be my guess on the auger. I read where guys are having trouble with the last inch of the hole though. Something about the blades were not the swedish made blades and it made a edge on the last portion of the hole, that could cause some problems with cutting the line if you had a good fish on.
I have the 7" lazer, but need to replace the blades on it. When i bought mine i didn't get the one with the adjustable height, and that makes a big difference too. Of course mine is a hand crank auger. I know nothing about the gas augers, so i can't help on that. Good luck with the fishing, and be safe.