Reason people upload those bad seperate dumps is they are ignorant to what is good and bad.
Il be happy to explain the differences for you,
ecm+ape = non redump, stay away as these are mostly bad dumps.
iso+mp3 = downsampled audio tracks , stay away from um.
iso+wave = old style TOSEC, good but not as good as Redump.
single Bin+cue = This is known as a Darkwater Dump, missing some of the audio data.
Separate Bins+cue = Redump, Best Disc images you can get IF they match the Hashes on Redump.orgs website.
with TOSEC and Redump to make a single Bin/cue for easy emulating its as simple as mounting the cues in Daemon tools lite and using imgburn to create a new disc image