As has been said by now, the joint is the biggest difference with aftermarket arms. A Johnny Joint is pretty much the gold standard. The cheaper arms are going to have poorly built joints with poorly build materials and tolerances. While this is probably fine for street use, the joints will wear out much quicker, parts won’t be as readily available, etc.
You get what you pay for, believe me.
If you want to get into why one joint is so much better than another, talk to
@mrblaine about that but I would caution you to listen and not question him. If you have thin skin you won’t last more than a few minutes with him.
I’m also going to say that no one hear is trying to attack you whatsoever. You’re reading way too far into things if you believe anyone is actually trying to attack you or talk down to you.