At first I tried the Garmin Edge Touring. Didn't like the device -- unreliable and finicky.

I now use a Samsung S5 when I want navigation (Locus Pro for planned itineraries and occasionally Google Maps depending on the circumstances) and a Bontrager Node 1.1 for basic metrics (speed, cadence, distance, HR) fed by ANT+ sensors (the phone can display all at once, but is not 100% reliable, and useless as a total odometer). It is easy to build a route on a smartphone, even underway, even offline; theoretically possible on a Garmin device if you are extremely patient and do not mind "creative" routing.

As far as I am concerned, there is no comparison between a repurposed smartphone and a Garmin computer, if you want navigation assistance, with the possible exception of rain, when it becomes next to impossible to interact with a smartphone (rain drops acting as finger presses).

Having ANT+ sensors gives me the opportunity to wear a GPS watch (Garmin 910XT) to capture/upload data. I might have used it as a computer head instead of the Node1.1. It might even provide ultra basic navigation directions (I use a GPS watch when hiking).