FF7- PS1 and PS2 Edition Difference?? Please Help

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Hi Guys.
This is my first post, so please be easy on me if the following question sounds silly. Im waiting to get FF8 on the PS3 but thought i should play part 7 first as its had many good reviews.

But which one should i play? the one on the PS1 or PS2????
Is there a difference. I cant seem to find FF7 on PS2 anywhere.

Please clarify...

Many Thanks
Adam