I have a Garmin Forerunner 955 Solar. It lasted me for 16 hours continuous cycling last summer. It was picking up my power meter, HRM, GPS and recording it all. There was still 50% battery left when I finished. Unless you're an ultra runner I can't see you'd clock anything close to 16 hours continuous use up. The solar feature is a bit gimmicky. It might be useful for cycle tours... or long summer hiking trips. But I can't see it's worth splashing out the extra for it.
It navigates too. I've uploaded routes from Komoot when I've been on hol and completed runs using it. I've also used it to navigate me back (when out running). I've found it easy to follow.
I particularly like the way it tracks all the metrics like HR, HRV, blood O2, sleep, stress, steps and all my various workouts. Then it gives me an idea of fitness, progress, recommended workouts etc.
I can also upload music to it, then connect my Bluetooth headphones. I like to run without a phone, so that makes it possible (always have to have music on running).
Do get a screen protector for it. Both the glass cover for the face and protector for the outside of the face. It's quite big and can get knocked easily.