Ok i'll shoot first.!

The first 2 machines look ok at first glance and they are in some ways. . . BUT! . . . Now first let me say I don't have any hands on experience of these 2 machines but I do have expereience of machines that have been or are built in similair ways so I'll just point out the areas that would concern me and leave the rest to you.!

1st: It looks like it use's un-supported round rail which is not very good choice and prone to flex greatly reducing accurecy. . . . BAD very very BAD.
2nd: The gantry doesn't look very ridged and considering it use's un-supported round rail and the not so clear or close photos I imagine they just fasten into the sides which won't give much stabilty again allowing flex. . . .flex is bad and the weak link in machines like this.
3rd: The ball screw mounting in the gantry side looks a bit jubious and again I suspect not the best implimentation.
4th: They give little info on the control box and the components it's made up with. Again I suspect it will be a weak area and very probably using cheap all-in-one 3/4axis drive board. This is ok until problems arise then you lose all drives and your screwed unless your into electronics and can replace chips etc.
The control box or should say drives and breakout board etc are the heart of the machine and if weak or cheap they will fail sooner or later or cause much heart ache in other ways like missed steps or other mind numbing issues.
5th: Bit less of a issue but still possible.! The vfd is a weak cheap chinese make (Huansang) and an area I've had personal trouble with and wouldn't recommend. That said to be fair theres folks who have them and they are ok but like I say something to be aware off.
Also the Spindle is only ER11 which will restrict cutter selection to 7mm shanks.

Personally (and unfortunatly something I come across too often) I think they look ok to folks new to cnc because of the spindle and ali construction etc but if you look closer some important areas are skimped on and to be honest not easily corrected without major work. Often this is not realised by folks with little experience untill the machine is bought and it won't do what they want or perform upto expectations leaving them very disappointed.

Like most things in life you get what you pay for and really that applys to cnc to some degree as well.

Regards the Other MDL model I won't even go there.!!! . . . But I can put you intouch with someone who wll tell you every short coming of it if you have time or really feel the need.!!