It all depends on which you learn on and personal preference. Most of the Pilots here at work have personal planes and they have Cessna's however I know 2 other Folks who have pipers.
I dont know if you have your license yet or not however if you do have them what have you flown between the two ? what ever makes you feel more comfortable in go with.
Keep in mind Cessnas have bigger doors, and one on each side ! Pipers are harder to get in and out of.
This question could be the which is better Manual or Automatic question