93R has the benefit of having aftermarket bits available for it, whereas the B-series offers some nice upgrades (mag, coned breech) that are well worth the upgrade. I would personally lean towards the new B-series, but I also sold off my Mark II and 93R and replaced them with CZ 452's because I had issues with them.
Might want to wait and see what Savage has coming for 2018 as I can all but guarantee there will be some heavy barrel laminate options added to the B-series.
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