Have to say it. I don't believe there is "A BEST" unit out there. Just about all of them will suit someone's needs depending on how you use them and what you expect from them.
If funds are not a limitation I would recommend looking at the Garmin Ice units with Panoptix or now you can adapt Livescope to the ice. Lots of Panoptix videos out there, but Livescope is new to the ice and the open water videos are amazing. Love mine. Sold all my flashers, my LX 6 and Helix units. My opinion for what it's worth.
All I use is an fl8. I have had it like 16 years. I guess I don't really believe in the zoom and all that stuff. Think the fl8 reads fish pretty good. And I hardly get any interference like my buddies, with there fancy Marcum's lol.
First fish today was a big fat grey 30 incher, so as a guide the pressure was off right away. Steady action spot locked jigging in 30 feet of water with frozen shiners. By noon we needed 1 Sauger and one Walleye. At 3pm we got a nice Walleye so we quit at 3:30 one Sauger short.
It was still pretty windy this morning but from the SW so fishing wasnt too tough.
Had to toss the anchor at 2:30 the 3 batteries in the Terrova were spent, thats how windy it was this morning.
Here are the pics
Not exact on the Max depth. Can on occasions, winterkill, although not often.
I have fished it numerous times as I know a couple home owners there.
There are are crappie, bluegill, bass, pike, and the lake owners stock some walleyes as well(they have permits to do so).