All three literally sound great to my ears. Yes, I know none are superlative samplers. Can you help me out here with this decision?
Triton:

• Do you have to re-load the expansion boards every time you power up?!
• Triton not compatible with Trinity expansion boards. Will Triton's replacement leave Triton owners in the dust?
• Official Korg website is not so helpful.

Roland XV modules

• No problem with expansion boards when you power up/down.
• No arpeggiator!
• Roland products historically back compatible. Eg--all JV owners' expansion boards can be used with XV modules
• Better official website but that may be negligle with forums like this and other unofficial web sites