Battles,
First of all, you need to realise, that the MSB is much more expensive in Europe than in the US. Trinity on the other hand - if the US $60k street price is correct - is slightly cheaper. That makes the MSB Diamond and Trinity comparable in prices over here (both 40k euro).
Would I choose the Trinity over MSB, if in Europe MSB was $40k and the Trinity was $60k ? That is a VERY difficult question, one I happily didn't have to answer. The last 5, 10 or 15% of improvement always carries the biggest price penalty.
I didn't have a chance to try the MSB Diamond Plus with the matching UMT+ transport and Power Base simply because, adding them would make the MSB stack much more expensive than the Trinity. At that was over my (already sretched) budget. My dealer swears by the superiority of the UMT+ transport with the matching Power Base vs the DAC's USB input I was using, but how much better the full stack sounds - this is something I cannot say.