I am trying hard to learn to appreciate all of them. For many years, I was a red wine only guy. As I got deeper into wine drinking then making, I vowed to learn to also appreciate some whites. Even though they are not my favorite, I now enjoy Viogniers, Rieslings, and Gwerts. Still not that big of Pinot Gri or Sav Blanc. I do enjoy a nice Chardonnay now. It is my dream to make a really nice chardonnay someday from fresh grapes.
My favorite reds are Petite Syrah, then Pinot Noir. A good Pinot Noir is so expensive that I seldom drink any, except at wine tastings, because I just don't (won't!) spend that much for a bottle of wine. I find that a good Pinot Noir is $50 and up! I have made some Pinot Noir from kit, but for me they are just not that good.
As a red drinker, who doesn't like a nice Cab, though?
I have never tasted a high quality Madeira, but hope to one day.
Except for a Petite Syrah, I actually prefer blends over straight varietals.