On the level 30 difficulty, not only does the Omnigul strike take longer than the CE raid, imo, it's more difficult.
1) Endless majors and ultras
2) Omnigul arena is too small
3) Cannot maintain DPS on Omnigul due to insane enemy spawn rate
4) Omnigul absorbs more than a shamwow
5) Nowhere to hide but the entrance room to the Omnigul arena
6) Omnigul moves far too much to maintain DPS
7) Wizard poison clouds obscure view of enemies even if not directly in the cloud
8) Wizard enemies constantly shoot arc blasts (pretty sure bungie said they would implement some new attacks for wizards)
Hell, I know I missed some, but whenever I beat the Omnigul strike, I almost expect a raid helmet or exotic award. Seriously, Omnigul should have a chance to award exotics.
EDIT: I AM NOT REFERRING TO THE NIGHTFALL WHICH WAS EASY AS HELL, I'M REFERRING TO LEVEL THIRTY STRIKE
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Without burn it's a slog for sure. I dunno about harder than CE though. We just make sure to use rocket launchers. Or clear adds jump on the bridge she is on and fire away with heavy machine guns and supers. When her shield is down she doesn't fire back. She screams before she summons adds. So run out, rinse repeat. Undying Mind is more of a pain IMO.