I don't have one favorite. I have a group of them that are all favorites (if it's possible to have several favorites; and in my case, it has to be, because I pretty much like them equally - over all colors that aren't in this group.
Anyway, it's light cream. That's kind of my staple. That may not be Number 1 at all, though, because light, gray-ish, mauves or else purple-ish, darker, mauves; and pale, purple/violent tone grays are colors I really like. I like SOME tones of pink, not all. I also like some subtle, pale, "off-tone" greens, like light sage.
I guess I like pale cream because it's softer than white but looks clean and light. The others, I think I like because they tend to be the more rare shades of colors that are found in nature; particularly in sunsets or occasionally in sunrises. To me, blues (as in the sky) are common. So are greens (as in grass and trees, although I like some very dark ones). Green that isn't on actual plants/grass, though, tends to really bother me. I can't really explain why I like sage, though. I guess because it's a softer, paler, green that's kind of different "in the scheme of a lot of colors". It's clean and peaceful. Gray with hints of purple: Oceans, rocks, mountains. Green and sky blue are both too common (and too bold for me). I like a lot of the bolder colors of flowers, some fruits, and tropical birds, but only on flowers and tropical birds, for the most part.
I guess I like the sky better than the earth, and those more rare colors of those more rare, beautiful, and fleeting moments of sunsets and parts of sunrises. The gray of the mountains and ocean water, I suppose, (besides being easier on the eyes) I like because they're the more stable aspects of Earth.
I see the colors of sunsets as the colors of dreams and awe; the color of the ocean as grand and expansive and forever; the color of rocks as clean, crisp, and permanent. As for the light cream, I guess I see that as a "default, other, artificial, color" that's not too white, too black, or too bold (like all other colors not in the group I like tend to be).
Maybe I like a balance of Earth, itself; sky (when clouds and sun have been dimmed, blended, and become beautiful), and, of course, the powerful, ever shifting, ever moving, ocean. :) :) Thanks for the question. I'm a little happier just thinking about these things. :) I'm a words/logic person. Those are crisp/sharp/common. I like less common, less bold colors.