As others noted, it depends on what you prefer.
We have the combo washer/dryer for two adults. We use it every few days. Over the winter we're typically gone for four to five months. Last winter, and this winter so far, we have not used a laundromat at all. We also have a gasser and while the Splendide 2100XC weighs 145 pounds we still have a comfortable margin on our rear axle. Heck, I opted for a factory-installed 90-pound sliding tool tray that's even further back.
We can do laundry at our leisure, no scrounging for quarters, no hauling laundry only to find all machines are in use and no one is around, no wondering who washed what in that machine before us, etc. We can wash everything we have except for the heavy comforter. That would require a laundromat if the dog barfs on it or something.
Some people say they want the extra storage while we've found we can pack less clothing and we don't have dirty clothing sitting around for a week. If we spill something on the clothes we can wash it immediately. We dry bath and pool towels so they are not hanging around raising the humidity and occasionally stinking.
We have the vented model and most loads are dry in 60 minutes although some take 80 minutes. Bath and pool towels take 20 minutes. And we don't lose any time after the washer stops and before the drying starts because it's a combo.
We use the propane oven a lot and yes, we also have a convection microwave. We also have a great convection microwave at home, a GE Advantium. But my wife prefers the gas oven. Tonight we had chicken cordon bleu's and tater tots.
The washer/dryer, like the half-bath, were mandatory items for us when we ordered this unit.
FWIW,
Ray