You'll squeeze a few more fps out of the 5R and on average, they are more accurate out of the box and the barrels supposedly clean up easier. That's not to say that you may come across a 5R that is a stinker but they are highly regarded as a very accurate rifle. It's still on my list of "must haves" as are many others lol.
Both are about the same price last I checked, I'd opt for the 5R. If you think you may change your habits at some point and want a lighter, smaller rifle for close up encounters, the LTR may be a better choice.
Poor mans LR rifle=Rem 700P.308/Elite 4200 6-24x50/Millet base/Burris Xtreme rings/Eagle stockpack/Harris 9-13" bipod