First I’d pick Humminbird just because of quality of SI and Di. Then ease of operation then if your lakes are on lake master card they are the best out there. Next pricing is pretty good on the 7. I have one on bow of my boat and I sit back quite a bit from it and can still see it pretty good though I would like to have a 9. And I’m no spring chicken with not the best eye sight. If maps aren’t a issue I agree the garmin 93 would be a good unit if you can still find one for that money.