I have a nova and a gmaj2. I never use the Nova, it's just not as good. Why? It's setup like a stomp box array, which I don't care for. The gain or boost features only work if you use that input, which is fine, but I like to have delays in the loop, and you can't use that setup in a loop. Additionally, I have the three button expander, which allows me to essentially have three presets. Three. You can scroll up or down, but that is one of the buttons dual functionality features. So, you are playing a dirty rhythm, have a clean sound and a lead sound on bank one, but you want to switch to a dotted delay or some other sound outside of those three, you have to hold down the 'up' button, release it at just right moment, click it again to confirm you want that next tier, and then click the preset button. It just isn't practical.
The sounds on both are comparable. The delays and verbs are great, but the chorus/phase/flange leave a lot to be desired.