Stand-alone GPS or smartphone?

I always used Tom Tom standalones but when it died I decided to test some Cell Phone android apps. I tried google maps, Waze (owned by google) and Tom Tom android app. I chose Tom Tom apps. The full map is downloaded to the phone so losing cell phone signal is not a problem. My problem is Waze and G-Maps are fine for a pre-planned trip, but if you are on a whim and want to start something NOT planned and have no signal, you are out of luck, that is not a problem with the Tom Tom app as the map is on your phone. Tom Tom is not free, it is $23 a year and they update the maps 4x a year. Sometimes you get what you pay for which in this case $23 is a small price for a very dependable GPS. Also better than the $100s you spend on a stand alone. I have also like the maps on Tom Tom, so I also get what I am used to. Good lane guidance and map zooms in when upcoming turns coming giving you a good view of what you need to do.