I Chose Chinese primarily because , by far, when we go out, thats usually what we get. Also, for the last 30 years I've had an addiction to hot and sour soup. I get it at least once a week.
That being said, Indian is a close second. Due to the intense and unique spices, i dont eat it as frequently. But, its unusualness ( of thats a word) is what draws me to it. Each time I get a new dish, its like tasting something completely new, with nothing to compare it too.
I have been branching out to other Asian foods ( Korean, Vietnamese, Thai, Burmese...). Although I like them a lot, I haven't experienced enough variety yet to claim them as my favorite.
Italian is probably what I cook at home the most. I grow a lot of tomatoes, and got to use them somehow. Im still working on last years batch. I froze over 40 quarts of strained tomato puree.
Being vegetarian, and my wife ( now recently turning vegan), restricts me from really experiencing some cuisines. Therefore, I have to concentrate on those that I can really get a decent variety of flavors.