Biggest advantage of TM is quality control, much much smaller chance of a lemon, if any at all.
Dboys all steel series are the best value for the money IMO, I've owned several. Their gearboxes have worked reliably for me for thousands and thousands and thousands of rounds so far, both older versions, and the newer ones with steel bearings and so forth. I have, and always will recommend them as the best value AK AEGs available today. Of course when you see the odd realsword AK for only $500-600 instead of the usual $700-1000, then it could be worth dropping the extra cash, granted that you're happy with a Chinese AK variant.