An underwater camera answers one question sonar cannot: what is that fish, and is it looking at your bait? Drop one down an ice hole or over the side of a boat and you see whether the marks on your flasher are perch or a school of shiners, whether the weeds are green or dead, and whether a crappie swims up to your jig and turns away. It does not find fish for you. It shows you the few feet of water in front of the lens, and in stained water that can be very few feet.
Most roundups compare these cameras on screen size and resolution. For ice and night fishing, four other numbers matter more: how much cable you get, whether the lights are infrared or white LED, how waterproof the camera and the monitor are, and how the battery copes with cold. We pulled every one of those figures off each product's own Amazon listing, and off Aqua-Vu's own page for the Micro Stealth. Where a maker does not publish a figure, the page says so. That happens a lot. Not one of the seven listings gives an operating temperature range or an infrared wavelength.
The ratings here belong to Amazon's buyers, read off each listing while the page was being built, and Tom has not tested these cameras himself. If you fish through the ice in water under 40 feet, a 4.3-inch IR camera with 50 to 66 feet of cable covers almost everything. Buy more cable only if your lake is deeper than that, and pay for white LED only if your water is clear. Check the current price on Amazon before you decide, because these swing a lot around ice season.