I did both. I started with i.v. DMPS for about 2 years and gradually switched to FDC with DMSA and ALA. I still took DMPS i.v. or injected it myself under the skin around the belly once in a while -- helped great when my FDC seemed to have gotten a little out of hand.
Weekly i.v. DMPS is *A LOT*, I would not do that for long. That's a protocol for severe and acute poisoning.
Have a look at my various postings for details and reports, should be possible by clicking on my username.
Experiment what works for you. Careful with ALA, my doctor only introduced it after 1.5 years. It started a whole new level and still has the strongest effect now -- as it should at this point, according to my doctor. Don't take it too soon.