Man, I don’t know if I could pick one favorite. We use different sauces for different cuisines.
We probably have close to 10 bottles in the kitchen that are all used at least on a weekly basis or more.
The standard fare hot sauces are Crystal, Goya, and Louisiana. Pretty much plain old hot sauces. I use these for most dishes, especially any Cajun or Puerto Rican dishes like rice, beans, stews, soups, etc. Everyday eating, chicken, eggs, whatever.
Then there are the Mexican hot sauces. Cholula and Tapatio. I use these on well, Mexican dishes. Enchiladas, tacos, tamales, burritos, etc.
And the Tabascos.** Regular and Chipotle**. I don’t really consider Tabasco a hot sauce, I put it in its very own category – Tabasco. 
I’ve got to say, the Chipotle Tabasco is amazing, and I’ve been putting it on damn near everything from burgers and hot dogs, to chicken and steak.
Frank’s Red Hot – We pretty much use this exclusively for hot wings. If I ever get around to making myself a bloody mary, I’d probably use this for that as well.
And the super hot.** Death Sauce **(Actually we have Sudden Death.) I’m not a big fan of the super hot hot sauces that offer little taste and too much heat. The Death Sauce, while definitely being a hot hot sauce (and I love hot and spicy foods and can tolerate them pretty well) is tasty. It adds great flavor to things like chili, soups, etc. I pretty much only use this one for things like that, stews, and so one, ‘one pot meals’ if you will. Just a few drops in the mix gives it a nice kick and great flavor. It’s not the kind to dump on your food. At least not for me.