Welcome to Librarium Online!
I know any list can wipe out anyone else given the right curcumstances. I just picked up the beginnings of my WAAAAGH! and after looking through the Ork DEX these guys seem to be the one's I favor. I know I'll have to give my Warboss lucky Tatoos and take 2 loota squads as core choices but aside from that is there anything you pros feel the Death Skulls can't do without? I have quite a few IG HWs left over from my last project so am thinking of taking Lascannon and HB squads as my core choices. In the deal I also got a Basilisk, Lemann Russ and a nifty FW Battlewagon with a Zapp gun, 4 bolt on Big Shootas and 2 TL Big Shootas. I know this thing is just going to scream "Shoot me first". But what the heck. I have tons of Imperial and Chaos vehicles available for looting so suggestions would be appreciated.
First word of advice: stay the hell away from HB with the "oops sorry mate" rule you'll kill your own squad faster than the enemy can, take only the looted weapons that fill a niche that orks normally lack, long range firepower so lascannons, missilelaunchers, autocannons and mortars are the best choice to boot for your lootaz.