When you say Barrel profile - what do you mean?
I have fondled a T3 Sporter at our local gun shop and drooled on it a bit and then handled the TRG-22 which cased me to slobber all over the place but Im not familiar with the M595 Master Sporter or how it differs from the T3 Sporter
Read this (it is what sold me on the T3):
http://www.kineticresearchgroup.com/media/2shop/articles/The Case For and Against the Tikka T3.pdf
In summary, through innovative manufacturing efficiencies, Sako (Beretta) was able to design an action that is every bit as good as their Sako 85 line (I own one as well and love it). I believe the T3 is one of the best commercially available actions for precision builds. Not that I am in any rush to replace the factory barrel which is currently yielding .5-.55 MOA groups (bettering my Savage 10BA), but I have a heavy profile SS Krieger barrel on order for a future swap to my favourite calibre: 7mm-08.
In no way am I disrespecting the TRG, but I have absolutely no interest in acquiring one, as it does not meet my future needs, and quite frankly it is grossly over-priced. I prefer to spend my coin on upgraded glass, custom barrels, and aftermarket triggers. I suppose if you don't fancy custom builds, the TRG is pretty damn nice.
Lastly, I am pretty anal about my tools, and I am left with the overall impression that the T3 Sporter, even with a few chincy bits, is a top quality rifle. I would like to add that you need to shoot a well set-up T3 to understand the meaning of a "shooters rifle". I guarantee you will not find a smoother operating action and a smoother magazine-fed rifle off-the-shelf, anywhere. I go through rifles like some people go through water, and I only settle on a few "keepers" and Sako hit a home run with the T3. Don't be surprized if Sako, over time, begins to meld their line-up to take advantage of cost-effective and proven features found on their Tikka T3 line, including glass reinforced composite materials, which like it or not, work extremely well without the weight and fuss. I hope this helps.