I've always thought the DFT to be the better of the Weber twinchokes. Mechanical second choke. I'm not sure what the DMTR is? Is it the round top one? I've always known the round top as a TLDM. Whatever you use, invest the money in an overhaul kit. Weepy gaskets and hard, 25 year old perished diaphragms are a good way to lose power and waste petrol.