I tried the first gen Horus and found the screen to not be readable in bright sunlight (too many reflections). And the battery life to be quite short compared to the Taranis. Supposedly you can use a high-contrast theme and be able to see the Horus screen in sun. But it is the exact opposite of the Taranis. If you run telemetry scripts on the radio and have useful info on the screen, the Taranis is 100% usable all day without a backlight. Even if you do use a high-contrast theme in the Horus, the backlight still has to be at 100% to see it, which shortens battery life.
That all being said, I use a Taranis, but a Taranis-E (X9E). The E runs for 12 hours on a full charge before the low battery warning comes on. Which is important for me as I fly sometimes 8 hrs in a day and don’t have time to mess around with generator or a car charger in the field to keep my radio alive all day. The only time the radio gets a rest is when the helicopter comes in for a refuel, and that’s usually only about 15 minutes. Of when I pack up and move to a different field (I fly ag survey work).
For me the Horus was a non-starter. Fancy styling with absolutely cheap-feeling buttons, a cheap TN-film screen, high power consumption, and lots of hype included. I still have my Horus in a box here for the last two years. I set it all up and was thinking this was really cool, the Kool-Aid was good. It lasted all of about one hour of actual flying in the field with it to put me in the category of “not impressed”. I was going to sell it on RC Groups but nobody wants it because it’s a first-gen. So I’m saving it for parts. Quite a few of the parts in it interchange with the X9E, including the gimbals.