Out of the electronic displays, the vario needle of the AirGlide S is the easiest to read in direct sunlight (see picture of last page at https://www.segelflug.de/tests/LS8/LS8.pdf). It has superior contrast compared to the recent LXNav varios (V8/S8 etc.).

The square ClearNav-Vario display also offers good contrast, but no classic needle anymore. It's a good vario. But for us customers in central Europe, it is more or less out of choice now due to a lack in customer support.