I’ve used GPS devices from both Wahoo and Lezyne (and Garmin too), though I’m much more familiar with Wahoo so that might make me biased.
Wahoo seems to be the better choice for navigation. There are literally dozens of services, most of them free, that you can connect to your Wahoo account for finding and following tracks. For example, you can find or create a route in Strava, and automatically send it to your Wahoo to follow on the trail.
Lezyne does offer a few units with color displays which does make maps easier to read than monochrome.