Tiled Maps?

I've been playing around with the blitzmax demo for ages now and have come back to blitz3d to do some 3d stuff so I'm a little rusty with it.

Anyway, I'm gonna try and make a kind of rpg/rts type game with 3d maps (obviously) and I was wondering if having tiled entities to represent the maps is an efficient way of creating maps or should I just have one huge mesh for the map? Terrains aren't versatile enough to create the maps I want.

Thanks in advance