I would recommend buying an oxygen purity meter if you go the route of concentrators. All my concentrators run above 94.7% pure and that has a lot to do with their performance. Just dropping to 92% which is around where most oxycons operate, you lose considerable heat.
Just for reference, my Bobcat can make 2" marbles without too much trouble on 15lpm. I also make cups and pull murrine sometimes. Not quite the same on 10lpm since that last 5 makes a big difference. My Lynx (Phantom center) can do it all as well but needs closer to 25lpm at 6psi so I bought the OG20 and ran 10lpm at 15psi which was slightly hotter. In the end, I went HVLP so I can run my Phantom outer too.
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Bobcat on 15lpm and Phantom on HVLP
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