I would say the ACCUBOND because I have yet to get the MRX bullets to shoot decent or hear of any one getting good accuracy, not even decent. ACCUBONDS will kill just as dead and actually hit what youre aiming at.
Just my 0.02
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.