hmm.. the weird way my mind works, I'd have to have some additional context to the question-
what character do you like the most right now? Cage, as a regular figure in the
New Avengers.
if either had a new ongoing series, whose would you subscribe to? Cage, since we've recently had an enjoyable Panther series.
who'd make for a great 65-episode animated series? Panther, the most 'natural' opportunity for globe-trotting (and galaxy-hopping) episodes, multiple guest heroes of all kinds..
who'd make for a great, done-in-one movie? Assuming an ambitious budget was enabled,
Panther.
who'd you want to have your back in a street-fight? Luke. bullet-proof and bench-presses trucks.
So, based on my unscientific criteria, it's
Luke Cage by a slim margin.

(by the way, I really hope that Mr. Reggie's team-up arc gets animated- Panther, Cage, Blade, Dr. Voodoo, Pulsar..)