I cannot decide!! This is too difficult!
*gun clicks*
Okay, if I must....
No. 4, Have I Got News For You. Always depends on guests. And guest hosts make being really funny difficult.
No. 3, QI. Stephen Fry and Alan Davies are great, but bad guests can make it awkward.
No. 2, Live at The Apollo. Bit schitzophrenic, this show. Depends on the comedians. Most are good, but some are terrible.
No. 1, Mock the Week. Good group of regulars, most of the guests are good. Also, big fan of Russell Howard. (cute in a boyband kinda way, although he is also funny)
Edit - I've just thought that such an in depth analysis wasn't necessary. Oops.