Highly recommend the C series for sub $750-ish price point. They’re a solid optic. I had a pair a few years back and was more than pleased with their performance. They were the first bino I had used at the time that I could truly sit behind all day without issue. Great color fidelity and solid low light performance. Only drawback was the relatively narrow (comparatively) field of view.
In comparison to the BX series, there’s no comparison. Leupold is last place from my experience. Horrible facial ergonomics and a general “gray” color hue in all leupold glass puts them at the bottom of the totem pole for me. I would buy the C series 10,000 times over before I even considered some Leupolds.