For me, it's the whole '70 front end, from the fenders and hood, to that awesome grille. I also dig the big, round marker lights/turn signals in the front bumper, hanging out on either side of the license plate recess. The whole car looks a little less blocky and maybe a bit more muscular than the '69, at least to my eyes.
As far as the rear end goes, I like the '70 better as well. The tail light panel mirrors the shape of the grille and the horizontally split lights just look plain cool.
This is not to say the '69 is ugly. I'd drive one all week long with no complaints. :D
Also, I see there are many folks out there who wouldn't mind getting the keys to a '68 Charger. Show the love!
