Flexibilty for me
 

On the other hand, I use my phone on 3 different bikes with 3 different methods of affixing the same phone to each of them.
The 3 methods are -
a X grip system - a chinese copy of an expensive version.
a "waterproof" case.
a purpose designed bracket purchased via ebay.

Two of those 3 listed above have an inbuilt usb charging port (and they are connected directly to the bike battery) - one of them has two such charging points for different amperage.

I have also "used" my phone on a bike with it in my pocket - this was for recording a track at the time.

And, the same phone goes onto a mount on two other 4 wheeled vehicles.

I use an iPad Mini in a Lifeproof case in conjunction with a Bad Elf 2200 GPS transceiver. In addition, I use an iPhone 7 Plus. The only downsides to this setup are:

1. The iPhone cables go bad due to vibration. You must carry extra cables. It looks like they short out due to the closeness of the pins, but I'm not 100% sure.

2. Vibrations will eventually kill the camera in the iPhone . . . and maybe other things as well. They just vibrate apart after awhile. It's best to buy a used iPhone off of eBay to use just for navigation. Just don’t buy any used phone from a dude named Orangecicle. :)

3. Finding apps that work well on the iDevices is a challenge at times. Some of my favorites are Motion-X, Bad Elf (has a somewhat hidden screen that displays speed, altitude, and direction), and Avenza for PDF maps (although they now charge an arm and a leg to use the app). I also build my own apps, which I'm not allowed to talk about here. :whistling: