Lowrance has been used in the maritime industry for decades and has proven itself very reliable and dependable.
My son bought me the laptop version of Garmin last year and I love it too. I've only had a couple of issues with it's realiability (it took me to the Gulf when i was trying to find an inland street...I guess it really knows me
).
A buddy of mine from Melbourne, Fl. also had his Garmin totally screw up his route to and from Bradenton the other day. Not sure how it happened but it did. I finally had to get him to turn it off and listen to me. Took him right where he wanted to go
If the Lowrance is cheaper, I'd probably go that route.