Not too much point to it, especially comparing a Master Series vest to a Zephyr vest - the Zephyr vest is quite good and it is hugely adjustable for body types and sizes. Some find the Zephyr vest perfect for all but the heaviest payloads on big rigs.
Other "small rig" vests typically flex too much or don't distribute the loads as well as the big vests, but they also weigh less, generally cover less of you body for better heat dissipation, and are fine If one doesn't overload the sled.
Any arm socket can be put on any vest, so that's not an issue.
The key thing for any vest: it needs to fit you. It doesn't matter what anyone else says or prefers; your vest must fit you.
If you like the Master Series vest (which I never did without modifying it, but that's just me), and you want to use it, go right ahead.