VideosZ is another of the true deep-sea monsters of the directory, a colossal aggregator built on nearly 25,000 full-length adult DVDs plus tens of thousands of extra scenes, totalling a staggering 161,000-plus videos. If your priority is sheer scale, this is a net big enough to catch almost anything.

With 20,600-plus performers and unlimited downloads in up to 4K, it covers essentially every niche you could name, and the ability to actually keep what you download sets it apart from the streaming-only giants. The flip side, as with any aggregator, is consistency: because it pulls from thousands of DVDs and sources spanning many years, quality and resolution vary widely, so it is less uniformly glossy than a single flagship. Sheer scale is the whole pitch, and on that measure it delivers spectacularly.

At $29.95 a month it is premium-priced, but discounts up to 50 percent off are usually available, and unlimited 4K downloads make the fare much easier to justify given the size of the catch.

Who should climb aboard? Viewers who want the biggest possible every-niche library with unlimited downloads. Who should sail on? Anyone who wants uniform, cutting-edge production throughout, since aggregation means variety in quality as well as content.

Bottom line: VideosZ is a gigantic, every-niche aggregator with the rare bonus of unlimited 4K downloads. Quality varies with its DVD roots, but for pure scale plus the freedom to keep your haul, it is one of the deepest dives around.

VideosZ earns its place near the top of the category: best for Viewers who want a colossal every-niche aggregator with unlimited 4K downloads. Grabbed on the standing discount, it is one of the better-value memberships in its lane.