The L1011 and the DC10-30 have about similar maintanance cost. The reason for the DC10-30 being much more popular is the plus 12 to 15 tons it carries for almost nothing more of cost. Also it is much more reliable unless you have a very experienced L1011 maintenance crew (which, if you don't have it already you should not count on).
The Airbus is a nice aircraft for some 5 hrs of flying, but you need to be careful of MZFW and MTOW. Some of the early conversions are really bad. Newr ones usually quite good. Maintenance is cheaper than the DC-10 or the TriStar, but not as much cheaper as one would like to have it.
The DC10-30F will fly some 60T plus net over 8 hours (the plus very much depending on the alternate since you only have 20'000 lbs of fuel to spare (MLW-MZFW).
The Airbus will fly some 5 hours with some 40T plus.
Quite some caution has to be exercised in Hot and High environments. The DC10-40F e.g. wich usually is some 10'000 lbs shorter on payload than the -30F beats it after 6'000 ft of altitude, in certain cases (the higher it get the better the advantage) by as much as 15'000 lbs of payload.