I used the nub in pure and up until a few days ago I was using it in pulse.

Overall though I think I prefer the D-Pad. The nub has it's perks, I do find it easier to use on series' of sweeping corners and for more "smooth" racing. Thing is though I find it very hard to make small adjustments left or right using the nub (even on straights), which caused me to miss pads frequently, so I've went to using the D-Pad.