Me again…
I have probably recomended a smartphone on threads like this in the past, that’s before I got a garmin. Since then I’ve actually got rid of the fancy phones altogether, replacing it with a small, light weight, long lasting(cheap) Nokia which is much better at being a phone. ( another thread but people wandering around looking at their phone really annoys me)
The Garmin is better for training in several ways: its in front of you all the time saying your present and average speed, using doesn’t it consume the battery of your phone which you may need for phoning someone, you can create routes in garmin connect upload to your phone and follow them.
A smartphone in your pack with a downloaded map is maybe better for off road route finding but on roads the garmins are great especially suited to long B road routes, quick glance down to see a left/right turn ahead works very well no stopping required.
Try handtec for a deal.