u should check ping to each DC, google "arrstatus", then run cmd prompt. ping doesnt make that huge difference in this game, they improved the netcode from earlier iterations like dodging telegraphed attacks. some jobs r easier with high ping. ppl over 200 ping can still clear the most difficult content in the game. as for DC depends who u want to play with really and each DC have different culture. google "A Comprehensive Server Guide ffxiv"