I have both. I use lead-nav on my Mini. They both have their pros-cons. Truly both is the best way to go. I used both for the Norra 1000 and the voice promps from lead nav saved the day! I did my home work on the trail map before the race and it paid off. But if was the only visual GPS we would of been in bad shape.
voice commands (not a big plus for recreational driving)
Satellite map backgrounds (to zoom way in takes a large image and lots of memory)
You have other Ipad apps (music)
Yearly subscription for cool features
Ipad is very hard to see in daylight, must be plugged in all the time
impossible to use a touch screen while driving, especially racing.
It takes more work finding trails, routes, maps.
For recreational use, I almost always leave my Ipad in the motorhome. Lowrance wins.
You are more than welcome to try mine out sometime.