Martin and Erikson both throw around the battlefield dialogue, f-bombs and whatnot, though I think there were more in ASOIAF. In terms of tone, both are epics. Both stories have very detailed settings with lots of history. Martin's tends toward grounded fantasy whereas Erikson's work is more sword and sorcery-esque. If you're big on fantastic elements-dragons, demons, gods, spirits, fantastic races outside the norm of elves, dwarves etc-go with Erikson. If you like a healthy dose of realism or versimilitude, Martin's your author.