I have Navionics in my Lawrence and Lake Master in the HB, I like the Navionics better, maybe because I've used it more. The Navionics chip covers more lakes that I fish. Be sure to read carefully the lake list, because it mat not cover the lakes you are interested in. Ex. The Lake Master covers the South East but doesn't cover the South Carolina part of Lake Wylie ( I haven't tried the NC side yet
Just my 2 cents