120 (6x6 & 6x9) & 4x5. I have all of the gear but have been concentrating on 35mm for several years. Most of it due to lack of reliable transportation. Lots of 35mm subjects withing hiking distance of home that don't really justify the other formats.
That is changing soon though. A rebuilt transmission for my Jeep 4x4 is not far off. Took a long time to save up the $2200 for it and some transfer case parts. Then I can get to some places I've been itching to photograph with the other formats.