I have these 3 gloves
BGV1s I consider my first serious training gloves, and a great general all purpose glove. I just recently retired them this October, in favor of BGV9s. Also during the summer I picked up a pair of BGV14s to try out, because i was unable to find any reviews on them. Now I carry 2 pairs of gloves the BGV9s, and 14s.
The 9s are only used on bags, mitts, and general pad work. Any time contact is involved I use the 14s. That being said. The BGV9s are light years ahead of the 14s.
I consider the BGV14s a cheap entry level into gloves. The padding has a broken in feel to me. Feels soft like my worn in BGV1s. The BGV9s have a dense padding. Something i would not want to hit someone with. Lately I've also noticed my hands sweating much more in the 14s, than any other glove I've used. There is virtually no wrist support in the BGV14s. The lining inside the gloves is loose. The synthetic leather cleans up nice, and does not dry and crack like real leather. My BGV1s look beat up for less than a year of use. Another problem I have with the BGV14s is that they keep sliding off my hands, even with hand wraps. I constantly have to readjust the gloves.
The BGV9s, have great wrist protection. The dense foam sounds good on pads, bags, and mitts. Especially when my punches are landed correctly. Both BGV9s, and BGV14s, have the same thumb position, more Mexican boxing style versus the BGV1s Thai style. Even with the Mexican thumb style I have no issues clinching with the BGV14s. Craftsmanship, and Quality of the materials is top notch on the BGV9s. The leather came smelling like leather, something I do not remember with the BGV1s.
With that said, I would not recommend the BGV14s to someone who is serious about training Muay Thai. If expenses allow I would look into BGV9s for bag work, and BGV1s for any contact work.