Digidoc5+ is not even in same class as these. Dallas One Wire setups are really wonderful for this application, and the PWM/0.5C accuracy/32 probes possible design is a huge improvement over other simpler units. It's expensive for either of these but worth the money. Software for both is very good:
Matric Orbital uses LCDC. It is the slickest lcd software I have ever seen; install and immediately it pulls all the local weather, your internal and external ip, mbm data, etc. Very intuitive to set up the temperature based fan control too. The big selling points for the MO unit are its larger lcd, its ease of use, and its overall polish.
CF uses a WinNT service to interface between their crystalcontrol software and the CF 633. Not as intuitive (there is some bugginess in the GUI and I had to manually edit the .ini file to get it to work) but very powerful. The big selling points for this unit are the fact that the NT service lets you dump everything to MBM5 and the fact you can use the CF633 as a hardware shutdown device (you reroute power and reset switches through the 633).
Both units have USB to serial adapters on them I am guessing because when you install their USB driver it gets allocated a com port. I know that's the case for the CF; you can see where they've piggybacked the USB adapter on top of where a serial port used to be.
The Aquacomputer one also looks pretty nice, but more like a beefed up digidoc it seems than either of these are. Thermistors are nice for some applications though. Is that a $150 euro pricetag on it? That's over 2x the price of these, yes?
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