We also had to figure this out, and only after a couple of unsuccessful purchases did we realize how important it is to listen to others’ experiences. Recently, we came across a discussion where they break down in detail how modern boxing protection has changed, what to pay attention to, and which small details can affect safety. I think it would be useful for you to take a look as well — https://playingwithsuperpower.com/forum/off-topic-stuff/how-modern-boxing-gear-has-evolved-for-safety-and-performance/#p15887
They go over everything to the point and without unnecessary embellishment.