To be fair to both HXT LD Shafts, and OB2 shafts makers both shafts have high quality finish great workmanship no doubt. In comparing play-ability both play the same when you shoot shots with no english or a touch of english (rolling cue ball to rule out english throw), and high speed to rule out swerve, with consistent stroke
When using extreem english top right or left, or power draw left or right shooting fast speed, OB2 has less CB squirt than the HXT LD shaft; when shaft is bridged at a reasonable bridge length; sure if you use longer bridge with HXT LD it would reduce the squirt, but this is additional steps one could forget if he or she under pressure situation, but certainly could be adapted to easily.
I highly advise buying both shafts to learn pool, but if you are just testing and trying, i would side with OB2
Speaking of experience, i have 35 years total in cuing sports, and understand pool very well; I am continually working on my stroke straightness. True i am not a pro, but could be qualified as top APA rating, maybe A+ or a little higher with A++++ reserved for pro rating.