Hi Robert,
the prints can be very large, so the layers aren’t that visible. Also if you print in ABS you can use acetone to melt the surface, this fuses together and will make layers impossible to see. I would definitely go for the Ultimaker, there is a giant community behind this printer series (there are three size versions of the UM2). You can find all kinds of updates and modifications for free online, those allow other nozzle sizes (higher detail or faster speed), also more materials and hardware improovements, like dual extrusion, other hotends for higher max temp, other LCD displays, controllability via WLAN and much more.
The cube 3 needs proprietary spools, so you can’t use 3rd party filaments, which would be a lot cheaper or would provide other properties.
Two alternatives might be the Lulzbot TAZ5 and the leapfrog Creatr / Creatr HS. All of those have large buildvolumes and good print speeds + quality. I wouldn’t recommend to go full speed with any of those printers, but you can go decently fast. To get faster prints, it would be more important, to have dual extrusion, to have the outside printed with a high resolution fine nozzle and the infill with a rough large nozzle.
Please upload the photos you found on the website or publish the link, i can’t find the pictures. If we could see the pictures, we could explain, why those prints look so good.
By the way, there’s barely a print that can’t be printed perfectly, with barely any visible layers etc. however this usually requires a few prints to improove. Remember, that those are advertisment pictures, there were probably some tries necessary to get that quality, or the operator had very much experience with his printer, that he calibrated perfectly.
I’d highly advise you to search local UM2’s and Cube 3’s, to take a look at the printers and ask the owners for their experience, they have no interest in selling you a printer, so their opinion will be very objective and they’ll be able to give you beginner-tips.
Here’s the link to search for both printers.
Just to give you a hint: 858 UM2’s are listed, while only Cube 3’s are only owned by 28 hubs.
Cheers,
Marius Breuer