My votes for Dark Eldar, or Daemons.
Orks IMHO are pretty shoddy as far as codices go. It's uninspiring, limiting, and full of units or options that are in dire need of fixing (i.e. Zzap Guns). The rules didn't even stand up to the test of 5th ed without a hefty pile of arguments to prompt the dev-team to respond on major game-breaking issues (seriously, 2 freaking years to get a deffrolla clarification). There were even numerous typos, errors, and errata fixes within the codex's initial 6 months of release! And that's saying nothing of the clans being reduced to color schemes with barely a paragraph of background each, certain units becoming suspiciously similar to Craftworld Eldar aspect squads, and the army as a whole moving away from a CC focus and becoming an "always strikes last" army. I often find myself wondering if the players who praise the Ork codex are actually aware of what Orks were like prior, or the plethora of design problems.