I was lucky enough to fly on both the DC-10 and the Tristar. I did 10 flights on the DC-10 when in service with British Caledonian Charter, all were smooth and comfortable.
However, on the other hand all 6 flights I had on British Airtours Tristars were blighted with issues. Condensation pouring on my head, smoke from the galley, failed air conditioning, apu faults.