Oh boy where do I start?

j/k.
99 cobra
Pros: Better resale value, 4v engine, nice rims, limited # built, higher platform to start with, loves blowers!
Cons: IRS(Knuckle dragger speaking)

higher insurance and probably payments, internal parts more expensive.
99 GT
Pros: live axle, internal parts cheaper, insurance cheaper(I'm guessing), cost of car cheaper.
Cons: lower platform to start with, 80%(just a guess) end up putting a power adder on them to hit 12's, resale not as much as the 4v.
These are just off the top of my head. I'm sure there is more. They're both good in their own ways. I guess it really depends on how much money u wanna spend. I may be biased

but I would say 4v all the way. To each his own. -Mark
***Disclaimer**** This is not a flame.