Quick Rod is pretty much a modded Marshall, with a bigger but tight low end. Can get some good Plexi and 2203 tones out of it, through to modern heavy rock. There’s a video on our YouTube channel if that’s your thing.
Nitro has a massive bottom end, more modern voice, less upper mid Marshall aggression, heavier and has gain for days. Chugs like a mofo.
My personal preference is the QR, but I’m a real Marshall guy.