I have one alt on Balmung who's L15 now, and the rest of my personas (including my L50 PLD) on Mateus - and Balmung is freakishly crowded compared to Mateus, FWIW.

I should screenshot an "average" crowd at the Balmung Revenant's Toll, versus the Mateus RT

The Balmung crowd is much, much more "on game" for genuine role-playing though. So it's a wash, one or t'other.