Both are pratical every day shaft drive bikes with 150bhp+
Both bikes have very different qualities that make what on first glance appears to be the same solution to a question asked
The K16 ride quality is all day good with that 6cyl motor pulling well in the mid range. The steering is light accurate, the brakes strong with minimal dive but the suspension does rise and fall under acceleration, the gearbox is clunky and transmission noise is apparent.
The GTR is hard riding in comparison with a motor that once passed 6500rpm keeps building up its head of steam in an ever accelerating and increasing rush of induction noise exhaust howel and adrenalin. The brakes are strong, the steering firm with feed back and a planted front end feel. The gearbox a sweet delight to use. The rear suspension is the best engineered solution on the market with zero torque reaction under any conditions.
Both are equipped with good lights, luggage and equipment as standard. The K16 can be optioned up but at considerable cost.
The K16 is a low input bike to ride. It's all midrange and low thought process to ride well. This is its strength and also it's weakness. Leaving you to enjoy the ride have fun but in a controlled way.
The GTR needs thought skill and at times physical input to ride well and make progress on. This can be its weakness but it is its biggest strength. This demand both physically and mentally coupled to the mid to top end rush makes the GTR the more exciting and rewarding bike to ride well with an inner warm glow of adrenaline and smile of satisfaction on your face every time you return from a ride.
The GTR also has at least 2 interactive and very supportive forums. This one and on my side of the pond
http://www.gtr1400.co.uk/forums/index.phpGood banter, good support and info, good friendship.
The only K16 forum I'm on is ok but no humour / banter and new posts appear once in a blue moon.
GTR has few faults over its considerable production run..........the K16........where shall we start !
To answer your original question....................
I hope I never have to choose