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Due to the flimsy internet connection on first-party games, I used handheld most of the time, but now that Nintendo finally replaced their really old server provider (no really, it's 18 years old) with a much newer one, I might start playing docked more.
Aside from the first hour I'd owned Pokemon Let's Go Eevee, and about 30 minutes of Super Mario Odyssey I've played/only play handheld. To me it's just like playing a bigger Gameboy Advanced (with much better graphics, of course) and after playing Pokemon for over 20 years strictly portable (aside from side games like Stadium) it feels odd to play it anyway besides playing it handheld still.
Docked probably 85% or more. I only go handheld if I'm exercising on a stationary bike or in few other situations. And my Switch never leaves the house. If I have the power to play games on my TV, I'm going to do that, especially when the Switch is not that comfortable to actually hold in handheld and I think it's way too big for me to even really think of it as handheld at all. PSP-size is about the upper limit for a handheld size-wise for me.