Well, hm... I would say, take thr Triton Rack because of his expansion Boards...! Korg released 8 Boards with new sounds, each Boards own 16MB of sound stuff, Yamaha released a lot of Boards, too but they are mostly new syntheses like the DX and AN Board, but you were still able to make great sounds, too...! But, if I remember rite, you can only install 64MB to the sampler, 96MB on the Korg Triton Rack!! I would buy the Rack... and at least, the rack is cheaper!

frank