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The only major difference between the IANTD and TDI course is that TDI lets you use up to 100% wheras the IANTD course is up to 50%.
After that the choice of agency is less important than the choice of instructor.
Some IANTD instructors will only let you do the Advanced course if you are using a twinset and a stage but there are others who will let you do it in singles and a stage. There may be TDI instructors who mandate twins but it is not essential. I taught the course last weekend to two students who were both in singles and borrowed a stage each from me for the course.
As I said the main choice is finding a good instructor. If you are near the lakes then Mr Hayhurst at Dales Divers is an excellent choice.
I would also consider combining advanced nitrox with deco procedures. Advanced nitrox lets you use up to 100% as a safety margin on your deco, deco procedures lets you use accelerated deco and prepares you for longer or more adventourous deco.
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