I sit very close to my monitor and curve would bring edges more inline with line of sight(if that makes sense). But like i said i lucked out in getting a 34UM95 that has no BLB whatsoever(and i bought it off ebay, used believe it for $750 about 8 month ago or so) so as of right now i would not trade it for a curved but possibly full of BLB monitor. If i was starting fresh however i would go for a curved and probably Dell since LG 34UC97 does not have VESA mount(yet-they promised to add in later revisions though) while Dell has it already. The stand for 34UM95(flat LG) is quite crappy since LG was going for "floating on air" look and IMHO failed so i got an Ergotron MX mount and now can adjust it anyway i feel like at any day. Stand on 34UC97(curved LG) is a decent improvement over 34UM95's stand but still far from having a monitor on a fully adjustable arm.
I myself am waiting for the upcoming Acer Predator Z35 monitor which despite its harsh looks(some like it however) might be the best 21:9 to date yet with one inch larger screen(35"), Freesync(AMD's answer to Nvidia's closed G-Sync) and few other new features. There is a but however and it is that resolution is not confirmed yet and might only be 2560x1080 in which case i will be staying with my 34UM95 for a bit longer. However if it is 3440x1440 or higher - i might go for it.