Bass... I think this is a case of watching everything on each, perusing user forums , and buying with the understanding that you may want to try them both. If I had the duckets, I'd try the Akai first as they've included many if not all the NI products into their system AND zillions of others, whereas NI has done nothing outside of Komplete. As I'm saving for Vegas at the moment, this tempting new development isn't on the table for awhile but I was intrigued enough to spend hours watching all the Akai stuff and what I came away with is once it scans ur system and identifies the vsts, it includes all the patches you have. I assume it would include all my pluginguru omnisphere, fm8, zebra, serum, razor, and massive patches... I got that impression but would love to know.
I'm sure I have 10000 arps... would love to access them all from one place. Same for Orchestra stuff... they've got it down to all the different articulations, search wise... that's just tooo cool!
Then again, if Komplete is all ur thinkin' bout, it's a toss up. But Akai is more future proof at the moment and it's their big new play in the marketplace. Imagine they'll keep updating.