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I watch pretty much a bit of everything... But I mostly like Shounen... lots of action and humour is good.
I'm also partial to Shounen-ai and Yaoi. It depends on my mood.
shonen is actually a demographic, not a genre. and it's not all action. heck, believe it or not, Inu X Boku S.S. is a shonen. conversely you have stuff like Saiyuki, which while the first part of the manga was released in a shonen magazine, all the rest was released in a shojo magazine.
also, do you mean actual shonen-ai, as in, the genre specific to the 70's and 80's, or Boy's Love (also known as BL or Boizu Rabu) which is a genre that began in the 90's and is still going today?