I think i'll be able to try m50's before buying them but that's not the case with 598's,so if i like how m50's sound for my type of music i'll prob get them. However,currently i think i almost made up my mind to get 598's,because they are more comfortable or so people say.
From what i have read...
Planning to listen to music with them mostly,maybe skype calls or something like that,in general not much gaming. Music i'm listening to is alternative-rock most of the time,and i like slow,not loud music,maybe jazz.
Also I saw over the internet that for HD598 i might need dac/amp for i dunno...