Years ago, I lived (and raced) down in Mexico, and i used a local laundromat, which was kind of a PITA. And since I lived in the friggin' Yucatan jungle, my clothes were always soaked through with sweat, so i was going to at least give them a rinse in the shower, rather than let them sit like that till laundry day.
So, I eventually got in the habit of putting a shot laundry detergent in a 5-gal bucket, and hand washing them while I was in the shower. It was a pretty quick and simple system, and I got the clothes right back into the rotation. Win/win.
Now back in the states for several years, I still often wash them the exact same way, though I will also just toss them in the machine with a load of regular clothes, if I'm about to do a load already.
So my answer is........BOTH.