You could tell the difference between perf mode and 4k mode in DSR but perf mode already looked so good that the additional motion clarity in 60fps made it far superiorFor me if 60fps mode is a PS360 Vaseline then I go for 30 fps. This is always true if the 60 fps mode is very unstable and always drops toid 40s.
Not every developer is as good as Blupoint. Demon's Souls 1440p mode looked exactly the same as the native 4k image. The 60 fps mode was like a magical upgrade that compromised nothing.