I have a marchand XM44 I have just about finished assembling, and will provide a sound evaluation in the next week or so. I have had the XM26, which is good with Ss, a bit too soft for tubes IMHO.
The best is the Pass, no question. But the price of admission is not cheap....but if you want the best and can pay the piper, grab it, it is likely to not be the weakest link in you system.