James
I'd take the PA28 if I were you.
Having learned on PA28s (but also done many hours on C172), the aircraft is very docile and forgiving, easier to handle in a cross wind when you're low time and very stable.
If anything it is too easy to learn in and the C152 would probaly make you a better pilot.
I've nothing against the 172 either, a great aeroplane despite the knocking of those who don't like spamcans - 36,000 customers cannot be wrong. The 172 has better short field performance than the PA28 IMHO.
If you choose the 172, you will have made a good choice too, but the PA28 would be my personal decision in your situation.