Video cards GDDR5 256 bit or GDDR6 128 bit?

Question

Video cards

Hello! Please do not throw sticks)
I am standing at a crossroads.
Or Gigabyte AMD Radeon RX 580 GAMING (14999)
Or GIGABYTE AMD Radeon RX 5500XT OC (16999)

I am aware of the difference between GDDR3 and GDDR5, there is an abyss. The question is, how big is the performance gain? And is it worth your money?

Answer 1

Look at the memory bandwidth, rx580 has it higher.