Bottom line, IMHO... it all boils down to what looks best to you.
I find that I prefer the picture if I send only 1080i to my set, letting the HR20 do whatever it has to do to the picture before it sends it on it's marry way.
I'm not an expert on the math and science of all of it.... I tried sending all resolutions to the TV and letting it do the changes it needed, and I thought everything was just a little better looking with the HR20 sent only 1080i.
I find that I prefer the picture if I send only 1080i to my set, letting the HR20 do whatever it has to do to the picture before it sends it on it's marry way.
I'm not an expert on the math and science of all of it.... I tried sending all resolutions to the TV and letting it do the changes it needed, and I thought everything was just a little better looking with the HR20 sent only 1080i.