Went looking today and found no justification for buying a separate unit, except as an interim. I’m surprised by the support the traditional units have. it certainly depends uop whether you like the app or not, but, in terms of accuracy didn’t find anywhere the phone wasn’t equal to the task. Yes, the case can take the edge they have over traditional units in terms of response to button presses, but realistically how long do you spend pushing buttons when cycling?
I use an iphone 6s plus apple watch, which is great for strava plus health monitoring activities, at least, the newer ones are. However, irrespective, i still take, where they exist, maps showing relief. Google map is usually more than good enough, but sometimes their routes can lead to unmade roads climbing up a mountainside
Memo to self: must try komoot .