Heartlessphil covered everything. Vray/Corona (which I would recommend) will give you a love more accurate results, but that comes with long render times, maybe not so much Vray-RT, I haven’t tried it out in ages. There’s a lot to factor in though. I personally like the PBR workflow in UE4 with Substance Designer, but I know a lot of people like VRays material editor better.
It’s such a hard question to answer because it all comes down to personal preference.