Most makers will use Carbon Fiber on a liner-less, and many use G10 also. Carbon Fiber and G10 will be the strongest, but it will also chip the easiest if dropped on concrete(or similar). You don't see quite as many in Micarta, but Micarta is my favorite. I have a Moki liner-less with Micarta scales, and I don't think I could damage the scales unless I was really trying to.
I love the TM1 design, and have thought about getting one myself since I love Micarta and a linerless design.
The Carbon Fiber version seems a bit overpriced(IMO), but the Micarta version has a very fair price(IMO).
I don't think you would ever have a problem with the Micarta or CF version.