Depends on what your requirements are. I personally prefer a built-in battery compartment. These are all decent frames, and I recently went with Qulbix Raptor. If I had the dough, I would go with NYX. You can also check out Flux Alpha or Beta. Great frames.
With all being said, these frames will attract too much attention, and probably not for everyday use without a moped title and Insurance, at least here in Maryland.