For what it's worth...I have an ARB Twin and a Powerplant. I bought the Twin first with the mindset I'd end up with a Zeon at some point. Earlier this year I found a deal on a used LoD Stubby and Powerplant that I couldn't pass up.
That being said, I've been using the Powerplant over the Twin out of convenience more so than anything. The Twin gets HOT...I had an air line burst on me last year right at the fitting near the compressor due to the heat/pressure. Otherwise the Twin is a great compressor and hasn't let me down.
I'll likely keep both for running an air locker in the future.