Just for the record I have tested and played with soo many different batteries its unreal
for daily driving you will not notice a difference in a Deka, XS power, Northstar, Powerware, C&D, etc. If both batts are of same age, group size, and conditions. I have pulled and tested this theory many many times.
As far as Competition use the Northstars and XS power get the slight nod, but they are very close to everything else (within tenths of each other on burps) There have been a few guys post vids of this exact thing.
So for what its worth 1 deka 9a31= 1 xs power d3100 in a daily setup. Unless you are competing and every tenth counts no need to spend that kind of money on a batt just for the name.