Built in vs. Stand-alone GPS?

I've had both (all three really with the cell phone). The in-dash was my least favorite. It was Garmin based and pretty easy to use, but eventually wouldn't accept an update for the maps. It wasn't adjustable as far as viewing angle so the sun would wash it out at times. The cell is good and I use it mainly locally, but the screen is smaller though it is usually the most up-to-date. The stand alone is my favorite. Larger screen than the cell; lifetime maps and so far hasn't refused to update; very easy to use; and I can move it from car to car including rentals if needed. It is a Garmin by the way that I've had about 8 years now. I have to keep it plugged in all the time because the battery is shot, but if I use the cell, I have to keep it plugged in also.