ZY-T08 have a considerably larger reflector. Close to 20$ is the cheapest price it have ever seen it (if it has not been on instant kill).
In general, MT-G2 likes larger reflectors. With the ZY-T08 you get a lot of pill space, so its flexible as a mod host. ZY-T08 is also popular because it uses 18650 batteries in parallel (safer setup compared to most other throwers) and its great value (even at 25$). Its very short and jacketpocket friendly compared to other large reflector throwers.
Here is MT-G2 in ZY-T08 build.
ZY-T92, not too familiar with it. I have considered it in the past, but to me, it does not offer that much. Im not a huge fan of the styling/looks. Its more of a general purpose light. As a general purpose light its got a lot of competition on both higher and lower price ranges depending on what type of light you want. There are not many driver circuits that utilizes both switches. Which is probably why its not that popular as a mod host either.
Drjones have a driver that is made for TK35, and similar clones. Lumo35drv. You might be able to mod that driver to become compatible with 2x18650 in series... Just an option that might work...