Both are good markers although the TGR2 Mk 2 (make sure that you get a Mk2) is what I went for eventually when I got my MagFed marker a while back and was faced with the same dilemma as you. It hasn't let me down at all and is easy to maintain, etc. Only thing is it has no adjustable velocity but instead you do it the old fashioned way by changing the spring (you get a variety of springs with the marker). It's actually very easy and quick to do and the thing is pretty consistent once setup.
Personally I went for a DAM as I don't like the idea of going backward to old tech. I've had a t9 if your heart is set on the real steel look I would wait out for the Tiberius t15. Changing springs really? This could be achieved with a grub screw like other markers lazy marker design in my book.
it depends on your own personal style of play. obviously you don't want to be carting about a T9.1 if youre getting up close but from what I have seen if you intend on plinking people off from a distance then they seem to be ideal for that sort of work!
Rap4 468? I've got a troy elite and it's awesome easy to maintain shoots first strike build it to what ever spec you want.
Don't think there everyone's cup of tea but suits me fine. They do 14,20 and 30 round mags and I think even a box mag.