Mining ETH RX 580 SAPHHIRE 4 GB vs XFX 570 8GB

[suciu_patrick]

Hello guys! I am a new person in this forum and I want to break the ice a little bit with my problem in mining.
Right now I want to start my mining business. I found an investor and our budget is 60.000$. We want to mine ETH
and we found some suppliers but the problem is that we couldn't decide which model to buy. We have two options SAPPHIRE RX 580 4GB or XFX 570 8GB.
Between these two, the price difference is quite big, aroung 70$ on gpu. Can you help me with some advices? Will the DAG file
be a problem in the future? Should we go on the 4GB model since our investition is not that big? Thank you for your time!