Ok I think this actually has way too much speculation and is asking the wrong question. Instead of "in your opinion globally are there more x or y", why not quantify it? Specifically in your instance, does your living quarters and personal belongings and other places you frequent have more doors or wheels? Go count them. We can actually solve this with enough data.
For me it's doors by a long shot. Almost nothing in my life has wheels. I live frugally and cheap furniture usually doesn't have wheels. I don't own Lego as other comments suggest. Drawers are not doors. Gears are not wheels. Eyes (wtf) and widows are not doors. The breakdown in my life is:
42 doors 15 wheels