I have mostly platinum with a few things in white gold. Now I am collecting a few pieces of yellow gold in Van Cleef Alhambra (clovers). After that, I should be done!
I woukd guess I have half platinum, half yg. I try to stick with 18k yg because I prefer the rich look but I do have a few pieces in 14k yg and a couple of pieces in wg. I do not care for wg very much but I haven't ever had a piece that wasn't plated. So maybe I just don't like rhodium. I also don't have any rose gold; it's definitely not my thing.
My rings are platinum, earrings and pendant white gold. I do have some silver. I only wear white metals. I think yellow is pretty on other people but it looks bad on me.
White metals primarily, but I am starting to branch out to YG. I actually have a few things that are mixed metal (silver or WG with a little YG accent) that I have had for a long time that I wear often. I mix metals, but I do prefer the look of certain types of stones with certain metals- for example, ruby with YG or RG, diamond with WG or platinum.