It is nearly impossible to compare to printers if you are looking to buy. There are "specifications" but they really don't tell you what you want to know: how good will my prints come out?
Printers tell you they have 0.Xmm vertical resolution, but even that doesn't tell you what you want to know. Some good printers have "lower resolution" than some bad printers. Then there is the matter of support material, PLA vs ABS, extruder size, calibration, print speed, etc.
I hope soon we will be able to compare 3D printers as objectively as a hard drive or cell phone.