I use a combination of both. For blm straight up controller. IF you Hold down Left bumper and hit the right bumper, Y, B,or X button you an switch targetting modes (all, Party,ally,enemy) handy for blm ect...

THe targetting scheme you use also plays a roll for ease.

IF you do not set walk mode to the controller, then when navigatign around hearign based mobs, you will need to use X on he keyboard.

General movement is much easier and procise on the controller, but some targetting, like whm, is easier with mouse