TomTom is spot on for me. Get the new 6200/6250 and you won’t regret it. Tried snooper - garbage. The thing that makes the tomtom so great is the live traffic. If mine broke I’d get another tomorrow.
Combine a TomTom with google maps and you will struggle to go wrong. TomTom to get you to the postcode - and google maps to get you to the door.
I’ve also got the Philips Navigator trucking edition - total garbage. Firstly the signs for low bridges and weight limits are so small you need to really study it. And secondly if you do any sort of distance you’ll have to flick through about 30 pages to get a route.
Best truck map/atlas is the AA one. Which I also have. Signs for bridges and limits are really clear and big. The mapping is a lot clearer. And you could use it whilst driving if you want… Also it’s scale is a lot more reasonable. However, it doesn’t have all the farms on like the Navigator.