Hi,
This may sound like a stupid question “but here goes”

I have a HDTV and a 360 add-on, the only thing is my TV doesn't support 1080p, so is it best to watch a HDDVD in 720p with it being “progressive scan” will it give me a better look than 1080i with it being “interlaced”?.

I know there's obviously more pixels on the 1080i than on the 720p but I just wanted to know what would be the better to run?

Thanks Guys.

Honestly man, let your eyes be the judge. That's the only real advice anyone can give you. So many things effect one or the other. Some things look better 720p while others look better 1080i. Depends on the movie also. Chick flick probably 1080i since there will be little action. Dude flick 720p since there will be more happening on the screen. I find that Dude flicks but with a lot of outdoor day action also does well in 1080i. But this is MY set and MY eyes. Your stuff may be totally different so just look for yourself and decide.

I just found this on the web;

Is 720p v 1080i worth being concerned about? Yes and no. If you're a consumer looking for a new TV, you can happily ignore the 720p vs. 1080i debate because every TV which is described as HDTV or HDTV Ready is required to support both formats.
NOTE: You should be aware though that lots of TVs which support 1080i have fewer than 1080 lines and so scale the 1080 signal down. That's not a huge issue as even scaled down 1080i is far ahead of a regular NTSC signal. It is worth bearing in mind that more expensive HDTV’s tend to have better scalers than cheaper ones, and this may be an issue.
However, for broadcasters it's a live issue. Should they broadcast 1080 lines of interlaced video or 720 lines of progressive scan? They could just broadcast two signals; one in each format, but that would use up a huge chunk of bandwidth and be hugely expensive for very little gain.
To answer the question, it's important to understand the difference between 720p vs. 1080i. A 720p signal is made up of 720 horizontal lines. Each frame is displayed in its entirety on-screen for 1/30th of a second. This is know as progressive scan (hence the 'p') the quality is like watching 30 photographic images a second on TV. A 1080i signal comprises 1080 horizontal lines but all the lines are not displayed on-screen simultaneously. Instead, they are interlaced (hence the 'I'), i.e. every other lines is displayed for 1/60th of a second and then the alternate lines are displayed for 1/60th of a second. So, the frame rate is still 30 frames per second, but each frame is split into two fields, which your brain then puts together subconsciously.
Most of the time interlacing works fine, but for fast moving images, such as sports like baseball and hockey it can cause problems which manifest themselves as a 'stepping' effect on-screen. Progressive scan signals don't have this problem and so are better suited to sports.
ESPN puts it like this: 'Progressive scan technology produces better images for the fast moving orientation of sports television. Simply put, with 104 mph fastballs in baseball and 120 mph shots on goal in hockey, the line-by-line basis of progressive scan technology better captures the inherent fast action of sports. For ESPN, progressive scan technology makes perfect sense.'
Bottom line is? For us, as consumer’s 720p vs. 1080i is not a debate worth worrying about, so you can relax and focus on all the other criteria on your list when you buy your next HDTV.

Hope it helps

Here's the one problem I see with the "720p is better for sports" debate, although the argument makes sense the problem is nobody ever accounts for the "human element" of filming sports. Sure you may "see the puck better" with 720p but 99.9% of the time the camera man can't keep up with all the action to make it worthwhile.

Then look at the "fastball" statement. Pitches are broadcast from behind the pitcher. So although a fastball is clocking high 90's approaching 100+ mph the actual on-screen movement of the pitch is very slight from the pitchers point of view.

There are hosts of reasons why one would technically prefer one over the other or whatever but basically it all comes down to the quality of the set. I don't have the best stuff but it's pretty decent stuff and over the years i can honestly I can probably count on one hand the times I've seen something that was egrigous such as stepping. Infact only once have I noticed it where it actually caught my eye when I wasn't concentrating to see it. And that was watching an episode of family guy where Stewie moved his head and there was a visible stepping artifact with his head.

The things that will bother you the most are the things you have no control over. Station quality and bandwidth.