Cessna/Piper
Funny but i totally prefer Cessna for the following reasons.
Far superior Flaps (Fowler) esp. models with 40 degrees giving a better landing performance and improved view. With 10 deg selected far better short/soft field performance. Compare pa28 140 to 172M say(same engine). Vastly stonger main undercarriage for people who cant land(training environment).Cessna has vastly superior slow speed handling(real important to me for commercial reasons) esp. models after "L" when the leading edge cuffs were introduced. Stall charectistics are unreal in a 172 - with a bit of power you can hang it up like a helicopter(providing you know what your feet are for). Cessna carries loads better for eg. my 172RG with 180 HP has 1000lbs usefull load and will cruise at 140 kts indicated from shorter field than an Arrow which has 20 more HP.
In short the Cessna wing has obviously been in a wind tunnel at some point and has been developed through models.
Piper is far prettier and therefore more popular i would guess