best for you would depend on how you want to use one. if you want to scout with it, the aqua-vu is the smallest and easiest to use and takes little space in your pocket. it is like a cell phone with a cable and a small bullet shaped camera on the end of the cable, so you know about what it would be like like holding it while turning the wire to look at the bottom or for fish.
i might add one to my list of things to buy if i see a nice sale on one, but i don't need it.
i don't use a camera to scout or haven't yet because i know the waters i fish already. even then, i use the sonar to mark fish. it's much faster and more simple. if i buy the aqua-vu, it would to try to scout with a camera, but then it would be in the way when i start fishing.
i have watched an aqua-vu owner use his to find fish and then put it away to start fishing. it deployed fast and was back in his pocket fast. so it has it's purpose.
i bought a camera to see what fish they are and how they react to my fishing them, so i want one unit showing everything all at once in one unit and bought a marcum lx9 for that reason i can watch fish on the sonar and on the camera at the same time and nothing extra to carry onto the ice. it's self contained, one screen shows both. it's also a digital sonar. nothing compares. the camera is much larger than aqua-vu and has a compass and a water temp indicators on screen. good to know if you want to move to some thing you see under water so you know which direction to move to.
night fishing is limited to the plankton and how far the light can throw. the more stained the water and the more plankton the less you see. i do fish in the dark and do use the camera when fish are being marked but won't bite to see what they are. the light will attract plankton.
day time fishing is also limited to the amount of light your camera has. more snow means less light and same with deeper water and the clarity of it.
being hands free is important, so a motorized camera mount is needed. marcum makes a wireless version and wired. none of of any brand is that great and these need many improvements to be made.
marcum uses bright white LED's and aqua-vu uses infrared for lighting.