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I only have wallpaper engine but I can completely recommend it. It runs smoothly, has good options, supports multiple screens and has tens of thousands of wallpapers to choose from. Every day there are new ones added and you can make your own papers. You can save and organise as many papers as you like with folders and such. Most wallpapers have their own options and customisation and some are even interactive or have a sound visualiser built in. There's really no reason not to go for it for the 2-3$ their asking.