The PS-Move in my experience is a better pointer, and better at motion tracking. A lot of it is software, but in terms of consistent quality of motion/pointer tracking, the PS-Move is better.
When it comes to button layout and comfort, I feel the Wii Motion+ is better.
For extra credit, that wireless Navigation Controller for PS-Move is better than the wired Nunchuk, and being able to use two of the PS-Move at the same time (like sword + shield control) is something that Wii Motion+ hasn't allowed (yet).
Did you know the Navigation Controller for PS-Move is full accelerometer + gyro, while the Nunchuk is just a dumb waggle motion like the original Wii remote was?