After many hours of reviewing Navionics+ and Lakemaster mapping, here are some things that I noted. The LM definitely has the newest satellite mapping. At least 3 to 4 years newer than Nav. But in my own situation, old data is sometimes useful. Old paltforms and wrecks that are no longer visible may have structure beneath the water. La Delta is satellite view and shows no depth numbers, but Navionic's don't have many either. So in the end it is valuable to have both.
Navionics/Onix also has the ability to click on a nautical symbol or icon and it will give you data about it. The data is not 100%, but I found it useful.
The LM mapping is slower when rapidily zooming and slower for the Overlay to overlay the base map. The quality of map seams are about equal.
The LM+ SE States looks good and will be my go to mapping for lakes.
Not much changes on lakes. But in La Marsh, structure and land changes are very dynamic and dramatic. A "football size area disappears every hour". "Two years ago, NOAA removed 31 bays and other features from the Buras charts". There is no way to keep mapping up to date for these marshes. You just have to deal with land not being where your GPS shows it. You better know where the channels are, either from experience or an older map. I know several people that got stuck in low tide and had to wait 20+ hrs for tide to change. It happens