It all comes down to cost. However, I would feel that the most stable platform would be the PA-28 Warrior. I have many hours in these things and they are great to fly. I cant give any good points towards the Cessna fleet as I have never flown them, so naturally I'm biased towards the Piper fleet.
The most important decision you should be making, is where I'm going to do my CPL/IR course and what aircraft is that on. The more stable and slower it is, the better. Trust me - when you do it you'll know what I'm mean!
Good Luck
Homer
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Duff, Duff, that Wonderful stuff. Ummmmm Doughnuts