
From this ship ask meme on tumblr
Thank you ヾ(•ω•`)o
falls asleep on the couch
Thorin. He sleeps more to begin with, and is less attached to his little rituals than Thranduil. Elves don't really "nap" either, so if Thranduil was sleepy, he'd pick a quiet activity and go into waking sleep for a bit. If he catches Thorin asleep on the couch, sometimes he'll balance things on his forehead to see if it will stay until Thorin wakes up.
makes friends with the neighbors
LMAO I think canon proves that neither of them is great at this...Thorin's not exactly personable among strangers (unless he has a goal), and Thranduil tends more to keep to himself, but if I had to pick one, Thranduil is better at being polite even when he doesn't feel it, so he probably wins this one. He generally believes in mutually-peaceful relationships with one's neighbors, whereas Thorin takes the "my business is none of their business" tack.
is the adventurous eater
Thranduil. He's been around longer so he's eaten a lot of weird/unappealing things, and Thorin generally prefers to keep to things he already knows he likes, although he's not necessarily opposed to trying new things. Also, both of them have seen hard times when they didn't have a lot of choice, so if it's down to "eat this weird/gross thing or go hungry," they'll usually eat the thing.
hogs the covers at night
In the instances when their sleep schedules align, probably Thranduil, by virtue of several things: a) Elves in true-sleep are very difficult to wake up. When he goes down, he goes down. b) Taller, longer limbs c) Stronger.
Thorin has definitely ended up clinging to Thranduil not to cuddle but just to stay under the covers. This is doubly the case in Dwarven beds which were definitely not made with Elven proportions in mind! Fortunately, Thorin runs pretty warm, so he's usually not too bothered when this happens.
forgets to do the dishes
I think neither of them. They both like to keep things reasonably neat, so keeping a shared space clean is probably one of the things they wouldn't argue about. Thranduil possibly has become accustomed enough to having other people around to do that though that he might on occasion forget it's his job in other places.
tries to surprise their partner more often
Another toughie--I feel like neither of them is very spontaneous. Thorin probably wins this one just because Thranduil's concept of "often" is a lot less often than Thorin's concept of "often."
Thranduil: I do spontaneous things for you!
Thorin: The last time you had a surprise for me was five years ago.
Thranduil, an immortal: See, I just did something!
Also, I feel like Thorin is not a huge fan of the unexpected, so while he might appreciate the thought that goes into a surprise, he probably prefers to just know what the plan is. He likes having his days organized.
leaves dirty laundry on the floor
See above about the dishes. Thorin might take this one being slightly less fastidious than Thranduil, and more single-minded generally, but overall I think they would keep a shared place pretty neat.
stays up til 2 AM reading
Thranduil. For one, he sleeps a lot less in general, and being immortal, is a lot more prone to losing track of time. It's not unheard of for Thorin to wake up in the morning and Thranduil is exactly in the same place doing the exact same thing he was doing when Thorin went to bed.
Semi-related, but even though he sleeps less than Thorin, there probably are nights when he goes to bed anyway, just to lay a few hours with Thorin while Thorin sleeps, because while Thranduil may lose track of his own time, he is very aware of how little Thorin has, comparatively :(
sings in the shower
Both! Thranduil probably more often, because Elves sing about basically everything and Wood-elves apparently really love singing about mundane chores. But they both do sing, and they both love listening to each other sing. Tipsy duets by the fireside is a favorite pastime, and neither of them is above a serenade now and again.
takes the selfies
They are both grandpas who scoff at this sort of thing no matter how many times Legolas and Dis' boys explain it. However, Thranduil is probably slightly more inclined. He knows how pretty he is. Doesn't always hurt to remind other people. Thorin views most social media as a privacy violation and never gives out his real name let alone putting up pictures of his face.
plans date night
Another one where I feel like they're relatively well-balanced. Thorin will take the lead with more traditional date activities--going out to dinner, going to the movies/theater, family events. Thranduil does more of the "let's stay up late and go to the park to look at the stars" or the "let's get up hella early and hike up a mountain to have a picnic out there" sort of things. To Thorin's perpetual chagrin, Thranduil is a hippie at his very core and will always come up with some nature-related activity for them.
There are also instances when Thranduil gets worked up about the whole "ticking clock" where Thorin is concerned and will plan a bunch of stuff at once to "make the most" of their time and Thorin always complains this makes him feel like he's terminally ill or something (which, to Thranduil, he kind of is). He usually goes along with it anyway though.