Mercedes-Benz SL550 vs. Mercedes-Benz 300SL - I don't think I've ever been asked an easier question. 300SL.
Lancia Stratos vs. Lamborghini Espada vs. De Tomaso Pantera GTS vs. Alpine A310 - That's a hard one. I'll take the Espada out because it's not very known by me and probably a lot of others. Second, the Stratos is out because...well, it doesn't match up to the other cars. Third, I'll have to take the A310 out because it's simply not a Pantera. It's still a great car, though, but I'll have to go with the Pantera.
The idea behind my last comparo was coupe vs. sedan vs. shooting brake vs. convertible. The winner of the previous comparo was the Jaaag, so it gets carried over to the next comparo.