There are 2 aspects of any printer. One is hardware. Other is software.
As Ultimaker, we want quality for both. So our hardware is top of the line, getting high quality and speed. Software wise, it's awesome. And I'm not only saying that because I made the software.
Cura is tailored to work perfectly with the Ultimaker. While still exposing all the knobs&dials under the hood if you want to get there to tweak things. It gets a ready stream of updates, and you can actually talk with me about possible improvements and stuff.
Do not know it. But hardware wise looks like a straight up copy of the Makerbot Replicator 2X.
Software wise, they just coped OpenSource ReplicatorG, which is old and dated compared to current standards.
Most likely invested a tiny bit in software to get their printer support better.
Also unknown to me. But hardware wise it looks like an Prusa i3. Nothing wrong with that, but the moving bed will impact quality a bit. Little other information available, most likely a 0.5mm nozzle instead of the 0.4 seen in higher end printers.
Software wise they are using Repetier-Host. Works, but not the friendliest package for most users, as it has lots of advanced features exposed by default. Do not invest in software development.
The big competitor. I cannot make a proper assessment on them as I would be biased.
Software wise they are closed source now, and are not that keen on supporting their older products. And they just released new products.
We got one of the newer Replicators at the office last week. Didn't start up, so we have to send it back. And one my co-workers had an Replicator2 at his previous job, and it had lots of play in the axis causing ugly prints. However. That's just 2 samples, and I'm biased.