Looks wise, I love the '71 Road Runner, but I wish its orange was better, its Hemi is not as cool-sounding as the Challenger's 340, and the handling is bad even for a muscle car.
Overall, I like the Challenger. It looks cool, has a great orange color (only the Lotuses have a better orange), makes awesome sounds, and is easier to drive than most muscle cars. Mine has 338 hp (no NA tuning), and although I'd probably win few races with it (except Arcade mode, where it dominates the A class, and some of the races with slower cars--slower cars as in under 350 hp and no racing $#!+ that would give the opponents a huge handling and weight advantage), I spend endless hours driving it in Time Trials around Seattle Circuit (race tracks converted from public roads are always the most fun).