I use the tough claw mount with an X-grip XL.
Used with the tethers it's kept my phone attached to the handlebars on my victory when I went down at 55mph and when high sided on the highway when the rear sprocket let go.
Use it on my 15 RG and have zero complaints still. I would trust it to hold much more than just a phone if I had to.
2015 RGS, V&H Power Duals, Bassani 4", Self-Tuned with TR, Detatchable TourPak, Custom Halo/Switchback turn signals, Rigid 10" lightbar, B54 amp, Polk MM1 speakers, custom EQ