Thiel Owners

Theiliste, May I ask if you plan to use the 3.7's and the 7.2's in different rooms, or rotate them in and out of service in the same room?

Rotate them both in the same listening room.
Therefore i would need to make the right choice of amp because the 7.2s are harder to drive.

I already decided that i would prefer the 7.2s over the 5is if i was going to buy a legacy Thiel.

LOL, I knew you already preferred the 7.2's over the 5i's, what I was going to offer for consideration is something else you've already said you weren't interested in.
Perhaps using Thiel's own SS3 subwoofer(s) instead of also getting the 7.2's would be a consideration. You'd get the same benefit of deeper bass, greater dynamic range, with less strain and greater ease. All the while putting less strain on your main amplification, and easier bass integration into your given room.
Just a thought.
BTW, the amplifier demands (if chosen with an appropriate amount of leeway) isn't really all that much different between these models.

No relationship to the seller:
No knowledge of this particular unit:
https://www.audiogon.com/listings/subwoofers-thiel-audio-ss-3-2016-12-30-home-theater-10549-mount-ki...

Yes i prefer not to use a sub, rather have a medium size room with good treatment and plenty of clean bass.