Whats better? 1994 toyota supra (MK4) or 1990 mustang 5.0?
Stock, a 5.0 mustang was quick for its time, but nothing too impressive. They will run mid-14s at 95-96mph with a good driver. The MKIV Supra Turbo was definitely faster stock, capable of running a 13.9@101. Both can be easily upgraded to go quicker, but dollar for dollar it's hard to beat the mustang. I personally know someone who built a fox body mustang (it was a 1984) for $1800 that ran 11.70s in 1/4 mile. Including the price of the car. And paint. You can't even get a decent running MKIV Supra for less than $15,000. For that price, you could pick just about any mustang made before 2005 and beat the Supra for less money.
Also, in the Supra world, there's an old, and mostly true addage. "What does a 300hp, 500hp, and 700hp Supra have in common? A. They all run 13s in 1/4 mile." The truth behind it is, while Supras are easy to get big power out of, just with big turbochargers, they don't tend to be able to do much with that power unless the car is already going 75mph. A stock supra will hook up ok on a drag strip, with a little wheelspin on a decent launch to get a 13 out of it. Modify it to get 500hp, and you get a lot more wheelspin, which negates most of the ET advantage. So instead of the stock cars 13.9@101 2.1 60', it would now run 13.7@118 2.40-2.50 60'. And the 700hp car? Well, the turbo for that car would be so big, that if you use anti-lag, you would just get massive wheelspin, and if you don't, you have massive lag. So it would be dog slow off the line, THEN blow the tires off, then catch traction and make up the time on the big end. This car would run a 13.6@138mph with a 3.8 60'. These aren't necessarily real numbers, but it illustrates the concept.