Wow, you must have a terrible set-up on the Michell. I'm not saying that the Michell is the best deck on the planet, but it is capable of very high performance when set up properly in a decent system.
In fact, my experience has been the exact opposite of yours. I had been playing around with some lesser turntables, a vintage AR XB with a Profile II arm, and a BIX with a stock Rega RB250. The AR had a nice, mellow, well-balanced sound, but it lacked the expansive soundstage, the wide dynamic contrasts, and the precise imaging and detailing of the Michell. What arm is on your Michell, anyway???
The BIX was a step closer to the Michell, but not quite there and it had issues with inconsistent speed all the time.
If your Michell sounds as you've described then there's no way that it's working right or set up properly. Years ago, I owned a VPI Aries with a JMW 10 arm and the extra flywheel and PLC. I was never satisfied with that deck and was much happier when I moved to a Michell Gyro SE II with an OL-modded RB250, which seemed more musical and better balanced.
Presently, I own a Michell Orbe SE and the Tecnodec and I have to tell you... They both KICK ASS!!!
I'm sure the Thorens is a decent sounding deck, but I highly doubt it comes close to the Michells in terms of bass reproduction, expansive soundstaging, and overall precision and detailing.
I've never used the Glider, but I know it's supposed to be a very good cartridge. I'd be willing to bet that my Tecnodec with the bottom of the line Benz MC20E-L (low output model) will stomp that Thorens combo into the ground, in convincing fashion (we won't even think about a comparison to the Orbe).
But this is the thing with analog turntables: setup is EVERYTHING. If you're not competent to do a proper set up, find someone who can help you. You haven't even scratched the surface of that Michell's potential...