Still have to say CF...
I like Streetdeck, but it's heavy, CF is quicker.
I like RR, but CF is easier to install, it's more like a product, athough RR has another goal of course.
Frodoplayer is nice too, only develoment is in a coma...
Neocar Media Center (the best skin editor, the most flexible framework, fast), but development is at a standstill for the moment...
Only SD and CF have a real commercial solution with navigation afaik, and for me that's a requirement (for the business).
The other front-ends I haven't tested lately, so I can't comment on them (although I like hybrid's product and reddeath's program, just don't know where they stand lately...).
Just my opinion