There is also one other significant difference, and that is with Lua scripting. Scripts written for the Taranis are not compatible with the Horus, as the Horus uses “widgets” for its TN display. While Lua scripting for the Taranis is very well documented, it is not for the Horus.
If you use a “packaged” script like yaapu, then no problem. If you write your own like I do it is more difficult on the Horus. I have a custom script for helicopters that has dual-needle tachometer for rotor/engine rpm, gauges for engine temp, generator, SOG and KIAS etc… Various people have tried (unsuccessfully) to port it to the Horus.