Selecting a DC-DC voltage inverter/regulator
Beside your reasoning, remember that the current consumption you mentioned for the opamps represents the current drawn at no load, so you should also count the loads, as well (if they do count). Then see if the two ICs can suply this much power as the datasheets specify 100mA max. In addition, LT's IC seems to have a far better quiescent current and, as you said, the external parts are cheaper.
As for other parameters to count, load behaviour, temperature, humidity, if they count, out of which the first may be the more important.
My guess: go with LT, same results, different prices.