Ah there's the one, rumor has it the Dell 34" is using that same LG panel. I'd go for the Dell personally for two, to me very important, reasons;
- Adjustable foot, I first got myself a ASUS 29" 21:9 monitor with a static foot and it just didn't cut it for simracing, as I could not adjust the height of the monitor in relation to my wheel. The Dell monitor allows this and I love it for it ^^
- Warranty and support, any monitor this big from Dell comes with free telephone and Next Business Day support, so if you encounter problems you'll have UPS at your door the next day with a new monitor picking up the faulty one and returning it.