Big yard, well fenced.
Small house, big yard. I agree that you can always add on to your house if you have room, and you can certainly minimize the yard work if you really want to. Heck, you can hire a gardener, if it comes to that. 
We had a kid who came around last winter a couple of times and shovelled our corner lot sidewalks for us; best $10 I ever spent.
Small house, big yard.
Can always add on, can do landscaping that minimizes the amount of lawn-mowing (or pay someone to do it for you), and it doesn’t feel like your neighbors’ houses are right up against yours.
Small house, big yard. Room for the 6 dogs and the 4 horses.
StG
Big house, small yard. In fact, we chose house over yard when we bought our home 17 yrs ago. We have never regretted our choice. So much more of our time is spend indoors, that lack of a big yard has never been a problem. Plus, we have three gorgeous parks within walking distance.
Big house, small yard. I spend much more time indoors than outdoors, and a big yard just means yardwork, which we both hate. Big house means more room to spread out and more room for the cats to play in.
I like house B because it sounds like a TARDIS (“it’s very small, but it still fits all of your family and belongings!”).
But seriously, I’ll vote for “small yard” regardless of the size of the house. I don’t have kids or a big garden, nor do I plan to.
Large house, small yard.
I like a small house, and I like a bigger yard. My yard isn’t huge, but it’s roomy enough to garden and have room for the dogs and the kids to play, etc. It’s like an outdoor extension of my living area.
I used to have a large house, and it was terribly hard for me to keep up. Now I have a much smaller house (about 1000sf for the three of us) and we can actually keep it habitable without too much trouble. I love it.
Small house, big yard. I assume you’re talking American standards of ‘small’ for the house, which isn’t small by British standards.
You and me, both. Unfortunately also on that list is housework, so I’m pretty much screwed until I can afford to hire people.
Small house big yard, so there is space (where I can hopefully plant itchy thorny bushes) between me and my neighbors. Also, I would want to pay as little as possible for the house so the small would probably be cheaper to buy and cheaper to heat and air condition. If we need more space for more people, tents and trailers can be brought in according to need.
At least housework is climate controlled and the neighbors won’t tsk tsk if you are a little behind with it.
Big house, small yard, very very near a nice park.
There is nothing more ridiculous than a bunch of f’ing big gaudy McMansions shoulder to shoulder, squeezed onto tiny lots in a subdivision with a name like Butterfly Acres. Hopefully what butterflies are left might get nourishment from the single big gaudy hanging baskets hanging in front of each monster. The yards are tiny but it’s not as if they’re going to be doing any gardening after the landscaper plonks down bushes and stuff…Myself, I have a medium size starter house and a big back yard surrounded by a fence. There is a birdbath, trees, raspberry bushes, ferns, violets, flower beds, and it’s quite a beautiful sight, half - no, two thirds - wild.
Big house small yard does not necessarily mean McMansions. There are some blocks in Chicago where every single one of those big houses with small yards were built 100 years ago and cost over $2 million.
Definitely smaller house with a bigger garden for me. I couldn’t imagine living somewhere like (to choose the first random spot on Google Maps that fits the bill) here. Were the builders involved in some kind of competition to see how much of the plot they could cover with the house, or something?
Big house, small yard. Less lawn for those damn teenagers.
Yeah you, ya little punk. Fuck off.
Tiny house, big yard (3/4 acre or so.) It’s on a dead-end road that abuts a private school playing field, and a block away there’s several acres of woods and open space. So, it’s quiet.
It’s just me and the dogs, so a big house would be a waste of space and energy. And, I’d rather do yard work than clean house. I used to live in a much larger house with the ex, but we only used a small part of it really.
About 1/3 of the lot is trees, brush and ivy no mowing required. A neighbor rides over on her mower and mows everything else for $30 every 7-10 days.
I’m having a small enclosed front porch built this fall, and next year hope to have a big covered back deck built in the back. As others have said - it’s not difficult to add on space.
We hit the jackpot with our house. Just under 1700 sq ft, not counting the basement sitting on 3 mostly-treed acres. Our landscape could use some serious attention, but I can call it a nature preserve. 
What little lawn we have can be mowed in about an hour (riding mower, except for the ditch) and in the fall, we have a mulcher/vac that’s towed behind the mower, so getting up the leaves is pretty easy. Then we dump them at the far end of the yard where they rot into wonderful compost.
Last place we lived was about a quarter of an acre with neighbors as far as the eye could see. I hated it. Plus there was an HOA there. Here, we have peace and quiet and no one giving us crap about our yard or making us pay dues. Yep, we’ve definitely got our little slice of paradise right now.