Data gathered from Switches connected online via Nintendo Account users

eyeball estimates based on this image:

51% of players use docked/undocked between 50% to 80% favoring either direction

31% of players use undocked mode 80% of the time or more

18% of players use docked mode 80% of the time or more.

Edit: sauce https://www.nintendo.co.jp/ir/pdf/2017/171031_2e.pdf

I played 95% of BotW in handheld mode, but I've been playing more of Odyssey in console mode since I have a new TV now

I wish they broke it down by region as well

For me it’s all about the game, and how you play it. All about control and if you can take it around.

Playing handheld mode mostly with indies, but with games like BotW and Odyssey, I just want to play it on a big screen mostly, then on handled before going to sleep.

Never taken my Switch out of the dock personally, probably never will.

95% docked for me.

Definitely interesting to see, wonder if Nintendo would be willing to accept more games that are handheld mode only?

I played a table top mode for the first time, yesterday. Might be my favorite way to play, now. Anyway, it's good to know. I'm just glad to have the option! I guess I play "undocked" more because when I'm home, every Console is competing for my attention. When I'm at work it's just me and my Switch.

Not surprised.  It makes sense since most Switch users are adults who can no longer dedicate hours playing in front of a big screen tv without interruption.  Kids and teens can but adults don't have that luxury.