I think my Garmin RV760LMT works well. I also use my Google map on my phone when I'm getting closer to where I'm going just for verification.
I've never been steered wrong except for one time it made me go one exit past where I thought we were going. I'm guessing it felt I couldn't make a bit of a tight turn with my rig. A few extra minutes added. Of course the next day I was able to see the turn, was dark when we got in, I saw it was a very makeable turn and I did make it easily leaving.
Love the rear camera that came with my RV760 as well.
Also my gps has up to date traffic notices that actually work pretty well.
And it's connected to my phone to let me know about weather issues in the area.