The two are quite different. Articoolo scrapes and rewrites a single article into a 100% unique variation. As such it can generated content that needs little editing. With a quick proofread and a few tweaks, it can produce money-site worthy content in just minutes from entering a single keyword phrase.
Article Forge is a bit different, it uses multiple article sources and mashes together highly readable sentences in minutes and creates spun Titles and Section Headers as well as allowing up to three spun sentence or paragraph variations. But note it doesn't spin on the word level. For that you'd need to link up a paid Word AI article spinner account.
However because Article Forge is a mash-up writer, it really doesn't create cohesive paragraphs with an opening topic sentence followed by supportive sentences. As such, while imminently 'readable' I don't consider the content useful for anything other than Tiered linkbuilding.