I don't think it matters one way or the other. Either is acceptable. The slides are made to be extended. Why wouldn't you extend them ... even for "extended" lengths of time? So it's really a personal preference.
We park ours at home too. I keep the slides 'in' when not in use. Reason? Well ... why expose more of the camper to weather 'elements' than you have to? When mowing the grass, why risk hitting the side of the slide with blow grass, a rock, or a stick from the mower. (less space, less to aim at, right?). We get some pretty good winds where I live, as my front and back yard adjoins open fields. So, pulling the slides in keep wind resistance at a minimum against the camper. It also keeps the top of the slides from getting dirty. One more thing, with the slides out, it takes up more driveway space, makes it a bit more narrow to drive around to get into the garage. And reduces the risk of backing into one of the slides with our car (or truck).
Now, we use our camper a lot, even in the drive-way. We have a 30 amp RV electric source on the side of the garage so we can be 100% functional. We enjoy using the camper throughout the week, or on week-ends when we don't get away. When we are actually using it for several days in a row, the slides come out and stay out.
FYI, my stabilizer jacks are always down unless attached to the tow vehicle. It keeps the camper steady and I figure more points of contact on the ground is less chance for wind to blow it around! (may never happen, but it also means we can pull the slides in and out on a whim, as it's always stable).