Groove and turtletax already answered but I'll respond too. Same as they said

Don't worry about the OSD. Yes it's a bit of a pain, but you do get on to it and as they said you aren't in there very much. Actually I would argue you are hardly ever in there once it is set up so who cares? Yes it is something you can fault the X34 for but I think it is a nitpick rather than a true reason not to buy. Price and performance should be way better drivers for anyone's choice. So if ASUS does the OSD better and the price is comparable no reason to not go ASUS. But if you find an X34 for a good price don't pass on it because you think "Uh... I might not like the OSD." There, that dead horse is sufficiently beaten!
And I bought the X34 because I found one used!

That brought the price into the realm of just "luxury product" as opposed to "crazy luxury product" lol But I will honestly say it is the best monitor upgrade I have ever done. Going from a 24" monitor to a 1440p 27" was pretty nice but going to this ultrawide format is really something to behold. Pricey (and even more so because it eventually drove a GPU upgrade too) but I don't regret it (or the GPU) one little bit!