I would have to say FF, but that is only because my experience with DQ is very minimal. I am however quite looking forward to DQXI and may pick it up when its released in a couple of months, but I'll have to see since FFXII: TZA is releasing just a couple of weeks before.

Regarding what some have said about consistency, as far as the main series games go, this is something I appreciate greatly with DQ even though as mentioned I haven't had much experience with the games in the past. Of course I also like the way FF tends to shake things up, but I think in recent years this has meant the soul of the franchise has been slightly lost. I also strongly account DQ's consistency to having pretty much the same key people involved each time, something that I feel FF would have also benefited from since the PS2 era when lots of key staff changed roles or left the company.