UF-Orozco should be done with UB helper (it's the fastest sticker set for UF). For 4BLD wings, I'd recommend BUr though (because r/r' is significantly easier on big cubes than E/S slice variants).
I think comparing Orozco with advanced M2 doesn't make sense at all. How advanced can your M2 be? There is no universal definition of what is "advanced M2". Sure, you can add tons of tricks and comms to basic M2 to make it far better than other intermediate methods, but at some point you're basically using 3-style (albeit a bad version of it), so it's not too surprising it surpasses Orozco and the like.

I can do the same with Orozco and add tons of comms to catch up. However, in the end the advanced M2 person is left with a worse buffer.
But you're also right that M2 - might - be a bit easier to learn than Orozco, however not sure if the difference is all that huge. There is also a method called U2, which is basically UF-Orozco except that you setup to a U2-interchange all the time; which cancels out just like the M2 in M2 does, then you have a method that is exactly the same as M2 regarding its difficulty but still has the benefit of faster algs and a better buffer. Although at that point you're so close to using Orozco that you can as well use Orozco, but that's beside the point (I actually took the route of switching from M2 to U2 and from there to 3-style so I know what I'm talking about, however, these days I know better and wouldn't really recommend U2 anymore because of it's inferiority to Orozco which is where I'm coming from).
After all, if you're dedicated enough to dive into 3-style, having to switch from a worse buffer / method might not stop you anyway.
I want to add that it's the general consensus among the top BLDers that M2 is bad (source: many postings from different people over the past few months / years in the BLD Support Group on Facebook). I hope that my argument that now consists of reason as well as appeal to authority can convince some people. ^^
PS: You're welcome, it was a pleasure to organize that competition and give everyone (near Berlin or from far away) the chance to compete!