I got an FL-20 Ultra Pack Dual Ducer for Christmas and have used it twice, it works great. I don't think it is any better than the FL-18, I would definitely get the Dual Transducer if you intend to fish both pan fish and lake trout like I do. They are both great models and you can't go wrong with either one, most of my fishing buddies have the FL-18 and we fish right next to each other and they see the fish the same. One thing is if you fish at night a lot the FL-20 does have night modes which makes the display not as bright and saves battery power. One nice feature of the FL-18 is the lip around the display, on the FL-20 there isn't one, if you alway keep it in a bucket for transporting it you will be fine, but in my opinion it makes the FL-20 screen more likely to become scratched. Good luck.