The Fantasy Pro II is not a Makerbot. There’s nothing even vaguely associating the Fantasy Pro II with Makerbot, really; it’s very much ECubMaker’s own printer. That being said, not being a Makerbot doesn’t necessarily mean it’s a bad printer; in fact, Makerbot seems to have been creating somewhat questionable printers as of late.
(The confusion may stem from some people associating most or all 3D printers with Makerbot. That’s not the case. Makerbot is simply one brand that sells a line of 3D printers, and just has a lot more recognition among the general public than other brands.)
I honestly don’t see a reason that the newer bigger one being cheaper is suspicious. Common logic would say so, but in the world of 3D printers the build volume actually affects the cost very little; what affects the cost the most is the quality of parts a company decides to use and the amount of R&D put into the design. If EcubMaker just decided to enlarge their existing design, the actual cost difference could be minute.
I still wouldn’t buy the Ecubmaker printer simply because neither the company nor the design have major recognition, and there’s really no guarantee of quality for a 3D printer besides a company’s reputation. I would also not buy from AliBaba, because that website is designed as a link between manufacturers and retailers, not sellers and consumers. (If it were on AliExpress that’s a different story.)
You could take a look at the Leapfrog Creatr like MB3D suggested. Another option, one I’d highly recommend, is the Ultimaker Original+ kit, as even though it’s a kit, it’s widely regarded as one of the best printers available and you learn a lot from constructing the kit that would ultimately help you become a much better 3D printer operator.