There is a section of this site for the MGT. You may find some information there, but for the most part it is a really new truck and not too many people here have picked one up. You could become one of the site experts on the thing. Give us you report when it comes in.
As for the Savage and the T-Maxx, I own one of each. I'll just say this...I have spent well over a thousand dollars to make my T-Maxx survive my driving habits and that was out of necessity...replacing parts and upgrading to stronger parts. I have spent only about an extra six hundred bucks on the Savage and that was by choice...upgraded engine, beefier suspension, etc.
If I had money for only one, I'd get the Savage hands down. Good aftermarket support that grows daily. Strong runner out of the box.
The T-Maxx is old news and rapidly getting beaten up by a number of new competitive trucks. The MGT is one of those new front runners...the only thing I would say about the MGT (not being an owner of one limits my opinions) is that being so new, it does not have the aftermarket support (but that will come).