Splatoon with split joycons is heaven. Motion controls work so well!
It's sometimes a little cumbersom to steer your gamepad on WiiU, because you move the whole controller when aiming with motion.
On Switch, I just wave my hand so effortlessy. It's like I'm waving a magic wand that spits ink all over the surfaces. Fabulous, I must say!
I'm loving the split setup, played Splatoon in the tabletop mode and everything worked just fine. The stand is actually pretty solid for me, you just need to wiggle it a little bit after setting up. It kind of locks down then, or gets a better grip or something.
Too bad my headphones has that annoying phone cord, that twirly swirly kind. Need to use my inears then... Oh, and speaking of headphones, I have no problems with sound levels, I keep sounds at approx 1/3 and it is enough. If I go louder, it's because my son is going full Hulk/Flash (depending on mood) in the house. Works just well, and everything sounds so good! Even the speakers are among the best I've heard in that form (tablets etc.).