OSMand is clunky and not particularly picky about how it routes you. Just out of interest, I plotted a walking route from Newmarket to home on both Komoot and OSMand. OSMand ignored virtually every footpath/bridleway etc. and instead routed me down main roads. Komoot, on the other hand, reduced the time on roads to the bare minimum. It resulted in a slightly longer - but much more pleasant - route.
Well, this is the thing, really. In my view there are 2 aspects to the gps navigation on a bike.
The first is planning.
The second is navigation.
In my experience (which is really not a lot because I just tend to wander around) there is no killer app that does both well.
And what "well" is depends on your own specific needs.
Yes, OSMand is not the greatest route
planner and it is not the handiest to plan a route on using a phone or even a tablet - but it will allow you to do it offline (so long as you have the maps downloaded in advance). For me, that is the huge advantage of OSMand.
And it will give you turn by turn navigation and voice navigation if that's your thing.
I use OSMand as an emergency navigation device. If I find myself in the middle of nowhere and I need to get to point A asap, it will get me there. At those times, I'm not too bothered about how it gets me there, just that it can get me there irrespective of phone signal/data allowance or wifi.
It's also handy for those times when you find yourself somewhere and want to mark the location to come back to.
I wouldn't trust Google maps to plan a route at all. It is handy though, for downloading a map and marking off places that you may need, such as campsites etc. That way you have reasonably accurate info on your area offline.
Having had lots of "fun" with my Garmin whilst touring, I'm keen to try running Komoot directly on an android phone instead. I already have I phone for day to day use and comms, so just looking for a cheapish android, with good battery life that would run Komoot. Any experience/suggestions welcome. I'd rather maintain a separate phone for the navigation and comms etc.
I tested a Garmin Touring device for about a month and thought it was totally unreliable. It crashed regularly. Had issues going off route and very poor battery life.
You could also consider a cheap tablet instead of a phone. A bigger screen makes it easier to see. There are a lot of Chinese manufacturers of pretty good tablets and phones. I have a Cubot phone and no issues. Good battery life, no problem running Osmand and takes surprisingly good photos. Previously I used a cheapy tablet and prefer that for navigation. But it's not in use all the time on the bike, only when I really need to be somewhere.
Just remember than phone/tablet screens can be difficult to see in some weathers and you do need a good mounting system and weatherproofing.