Laundromat vs. Laundry on the lot: Which do you prefer?

It really depends on the family and the story. I don't even have washers in my current stories or a laundry mat. I've used the laundry mat as a way to meet new sims when I had a single sim move to a town in a past story. With a farming family they had a very old washer and a clothes line rather than a dryer. I will use them as part of the challenge for a sim who wants 5 kids to raise.