Hatches have a longer wheelbase and the weight difference is almost negligible.

Fully gutted a CRX HF vs an EF hatch DX is about 40lb difference.

if you are really looking to make it a drag/race car i'd go for the rex, every pound counts.

If you plan on using it as a DD I'd go for the hatch, CRX's are targeted by cops and you will get pulled over a lot, even if you are not doing anything wrong.