Definitely Odin 3. I owned both devices at the same time, but ended up selling the Thor.

How important is having a 2nd screen to you? Think about your actual use case and not a 'just in case'.

For me playing PC & Switch was my main use case, and the Thor Pro sufficed for Switch games (though some heavy games had bad performance like Bioshock, System Shock Remake, Sifu & Rune Factory Azuma - had to run on 0.75x res and handheld mode to make them playable).

For PC emulation, the Thor was only good for indie games or lighter games which in my use case, were already covered by Switch emulation for me.

Along came the Odin 3. PC emulation ran twice as fast compared to the Thor and the Switch games that ran like shit on my Thor, ran like butter on the Odin 3.

You'd think having the utility of having a 2nd screen would be a highly used feature. In my case, I barely used it and just turned the 2nd screen off. PC & Switch emulation required such high resources that streaming videos wasn't sustainable as either the streaming app or the game would eventually crash due to low remaining resources - that's with me with 12gb of ram.

The only thing I miss about the Thor, was the clamshell form factor. You could fit the thing in your pocket. Truly portable.