Coverage where you want it how you want it is the most important.
With the Lakemaster coverage only the locations indicated as Lakemaster High Definition Survey are good. The other two versions are problematic. High Definition Survey and Standard.
Pretty much the same with Navionics. The Navionics HD locations are better than the other maps.
You can view the current Navionics maps on the Navionics website's WEB APP. Those are current as of today. There are two map layers. One is Nautical Charts (Navionics maps) and the other is Sonar Charts ( user generated data maps).
You can download the Lakemaster list for your region from the Humminbird Lakemaster site.
If just one or two bodies of water you are interested in is Lakemaster High Definition Survey, then the Chart Select program is a good choice for those locations. Lots of features/settings.
Just need to encrypt a SD card to download the map to. Only one location per memory card.
Humminbird Helix 12 SI, 1198c SI, 1198c SI, ONIX 10 SI NT, 360, RC-1