DMX dimmer/switches

Hi, I'm currently learning how to use DMX and wondered if anyone could point out the advantages/disadvantages of these two types of dimmers? I'd like to potentially control devices over the internet, and I was considering triggering things such as lights or solenoids with dimmers. Basically I'm just wondering which I should buy.

I'll be using this with the Super DMX shield.

It depends if you need to control mains-level lighting or just LEDs. I imagine the mains version is more expensive... The low voltage one does 9 to 24V at upto 2.5A/channel (60W/chan at 24V) but doesn't include a power supply...