If you want a stable platform to learn in then a PA28. Nice and easy to fly, friendly and forgiving if you get it wrong.
If you want something a bit more challenging to fly then a 152 will do the trick.
Personally I'd take the PA28. I teach on both types so I can appreciate the pros and cons of either aeroplane. A lot of it boils down to the one you feel happier in. If you're only just starting out, then I'd have a little trip in both and see which one you like.
Our club also operates a Katana. Bit fun getting in but very responsive, and introduces a constant speed prop. I like it as a trainer.
Happy landings
HOP