I use the Torpedo Captor X with my Vox AC10, since I like to record when I'm at home and I really love the sound of my amp. I was undecided between the UAD OX and the Captor X, just like you are probably. I've tried both, I've worked with both, but I had to decide which one to use at home, by myself. OX is great, but the Captor in the right hands feels a bit better. Out of the box, as a "plug-and-play" experience, it falls behind a bit. But in general it's not. It's more tweakable, there's plenty (really plenty) of cabs and mics. And the rendition of the cabs that you can purchase additionally is phenomenal. Really phenomenal. I love to use the Supro cab, that thing is outstanding. In general you can find really obscure cabs in the cab shop, you may find several versions of the same cab too. Let's say that if you've got time to really dig into the thing, Captor X wins. The degree of customization is hands down wider compared to the UAD rival. The object per se (the white box) is compact and all, but it would have been better if it had the knobs on the top rather than on the side for obvious reasons. Other than that, I love it.
Did I mention the automatic double tracking? Such a joy.
Another great thing is the fact you can split your signal, and record separately a "DI", or a "just head" and a "full amp" version. So if you wanna switch cab after you've recorded, you can take the signal that comes from the head, and send it into antoher cab with the plugin. Basically it's like reamping, but way funnier. In general it's a great tracking tool, but sometimes it's just so nice to A/B cabs easily after you've tracked your guitars. The IR list available on their website is huge. The info is quite detailed for each model, but it would be better if they put audio samples too which they don't.
Two Notes customer service is brilliant. I've contacted them for a few doubts about impedance. They're fun, they're fast, they're just brilliant.