tweecer vs excalibrator 2

hello i am new to the 4v cobra scene due to my father wrecking my 95gt. i had a tweecer for that car and was wondering how well that will do compared to the xcal. the tweecer is a pretty powerful tuning device, but can it change gear ratios and things of that nature? i am to not going to go crazy with this car for a while. all i will do is bolt on's for right now, so which would you guys prefer or recommend.

here is the car i just bought
http://classifieds.stangnet.com/showproduct.php?product=32229&cat=18
the car didn't come with x cal2