its all according to your budget, the 1j is alot cheaper to get together than the 1j, but parts availability is better on the 2j, plus the extra .5 liters but they have both been proven to make about the same amount of power... how much are you looking to put down?
The 1j is a little lighter, cheaper and is rare in the shadow of the mighty 2j. It's a close to the 50/50 you can get out of the 2. What I went with. Also not as tall either but pick the one that best suits you. Can't go wrong with either