Nvidea or Amd, which should I buy

RX580 is on my list, i dont know about nvidia, but i would definitely get 2 RTX580 as soon as i solve my money issue i am having currently.

I almost always vote for AMD over Nvidia. Much cheaper yet the same quality.

i think amd is better and cheaper! but i have tried both

Personally I wouldn't buy either, there are many other good brands out there that go under the radar, are lower priced and more reliable.

I personally use NVIDIA but I know that AMD is starting to gain more market share due to it's performance starting to become equivelent.

ofc nvidia, it is more stable and cooler. and many games working better than with amd

I guess nvidia cause, well, I use it and i think the over hype around it is worth it.

As being a customer of both ( GTX ASUS 1060 6gb OC Dual Fan & Red Dragon Vega 56 8gig ) personally believe that Nivida is getting and or already is stuck in like an Apple or COD loop. What I mean by that is they push out new content without any real upgrades and price it ridiculously and as fast as possible. I don't feel as the RTX cards were or even are necessary to spend money on ( That's my opinion ). I feel as Nivida is really in Intel's boat, they have been able to slack off and push out shit content with no competitors for customers to goto. Well, AMD has busted down that reality by giving an amazing performance for more than half the cost. Now the only downside I feel you'll experience is that not a lot if configured well for AMD ( I find to be bullshit btw but that's another topic and rant lol ). In all and all though I believe as of right now AMD has a better price and performance then Nivida and reasons stated above.

my first gpu brand was nvidia and i currently have AMD rx580

First I read your question as "NIVEA or AMD".
I was like whaaaaat?

In short, nvidia. I think it has a broader adoption and bigger support.