I'd say both.
My 19" LCD monitor has a resolution of 1280x1024 (can be had at 17" also). That's quite workable from the normal working distance (say 2 feet between your eyes and the screen.
A HD-ready TV (for HD-broadcasts) is 720x1280. If you want to view that resolution on 22" or 24" you'll need a viewing distance that's much bigger than 2 feet, so unworkable for use as a monitor. I'd go for 15" at most (or just a window on a 17" or 19" screen).
Just my opinion.
Kees
Kees
Hi..I just purchased a HP m7690n desktop.Now i need a MONITOR.The room it's going in doesn't have a TV in it so I'd like to (kill to birds with one stone if Possible).It's going to be used for TV VIEWING and MOVIES as well as surf the net....I've noticed that some TV"S come with a PC..Hookup..The monitor size i've been looking at is 22" and 24" around the $500.00 price range..before i get into SPECIFIC models what are the PROS and CONS to BOTH..

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic