What is the selling point for these versions? As far as I can tell the only difference is that there are less adds. For 2019-05, the previous release was relatively low res, but in the case of this gallery in particular, two extra chapters are missing and the resolution is actually lower.
@esteboid /g/1371037/03f13ebd6d/ Do you mean this gallery? The publisher only provides 1500x files for the digital web shop. Maybe the uploader has used waifu2x or other software.