I just downloaded the Sygic app to my tablet. It takes more memory than Osmand, setup takes longer, and it pushes the pay extensions more. It uses TomTom maps.
Both TomTom and OpenStreet have a larger usage base in Europe than the USA. But I have no complaints about the local coverage (Washington state) with either.
One thing I like about OSM on the tablet, compared to my TomTom GPS, is that it is just as usable while walking and biking as when driving. And I can record my track (just as with older handheld GPS units).
Google Maps can be used off-line - you just have to download selected areas.
Osmand doesn't like route finding for distances over 200 miles. But at that scale I'd prefer to use Google Maps when I have wifi access.