Interesting - great to have both for sure.I have an Extreme and a Luxman SACD player. I like them both and they both sound excellent. I do think a person might prefer one over the other, even with the "handicap" you describe.
I personally think the Taiko Extreme sounds better than the SACD machine in my room, but that is certainly not an exhaustive or objective comparison.
Aside from the comparison quite a while back, I prefer to leave the Luxman SACD player direct to the Luxman c900 "pre" and m900 amps...NOT through the MSB dac.
In that way, I can enjoy the original SACD/CD sound when I feel like it. It's excellent...but different than the Extreme. Both are fun.
Have you installed XDMS with the Extreme? Game changer, seriously. If you think it sounds great with Roon, wait until you hear XDMS.