Primary CR123 have about half the capacity of an 18650. I'd look at the mAh rating, I believe 1500 mAh is about the best you're going to get. If they claim more they're only blowing smoke up your......
Rechargables RCR123s are about half the mAh rating of a primary CR123.
Buy a "cheap" and a "duracell" compare them.
Always buy from a reliable source, only cheap batteries I run are in my TV remote.