Leviathan was where I came from before I went to Balmung. There's virtually no RP there (or at least there wasn't when I left). But you'd also be transferring to an 'open' server there, where bots and RMT spammers run rampant. Balmung is spared that for the most part because it's closed to character creation 99.9% of the time.

I'm not into RP at all actually (truth be told I didn't even know Balmung was an RP server until after I transferred to it). But given that there's virtually no RMT activity, I consider it an even trade off. Just something to be aware of if you plan on transferring somewhere with open character creation.