SD DVD NTSC vs PAL in UK

Say there were US TV shows recorded in standard definition NTSC.
Say they available on NTSC DVD and PAL DVD,
If you were in the UK and watching on a multiregion player to an LCD HDTV (or CRT), would the NTSC DVD usually give the best picture quality or might the PAL DVD be better in some ways?

What if you were watching them on an upconverting player to an LCD HDTV - would that make any difference (knowing that the version stored on PAL would be 576i and the NTSC 480i - even though originally they would have been recorded at 480i)?

I mean, 99% of UK TVs can probably playback NTSC, yet standard definition DVDs that were originally produced in the states are converted to PAL - is that catering to the 1% of UK TVs that might not be able to play it or will it genuinely give a better picture on UK TV's if converted to PAL? (ie. will it make scan lines less visible or be less flickery with the UK's 50hz electricity/lighting etc?)

Yes, but I'm talking about US TV shows (before they started recording on HDTV cameras - that will have been recorded on NTSC video cameras at 480i and 60hz), that are available in the UK on PAL (576i discs) but can also be bought on NTSC DVDs.

I mean, converting to PAL would reduce the frame rate, but might give less compression per frame and might possibly give more of the original colours?? (eg. more lines/samples of the original stored? not too sure about that though).

I think it might make a difference too if you were watching on an LCD HDTV versus CRT (chances are LCD HDTV's would be more capable of displaying NTSC colour ranges maybe than CRT TVs which might convert to PAL 60 which wouldn't show the true NTSC colours?)

Thanks for your help. So in general US TV shows shot on NTSC cameras at 480i should look the best on NTSC SD-DVDs rather than PAL ones.

It's a shame there isn't a site that lists all US TV shows and displays how they were recorded (eg. on 480i 60hz cameras which would look the best on NTSC SD-DVDs or on film cameras which might look better on PAL DVD (except for the speed-up vs judder issue) in PAL land - and imdb.com doesn't always show that info).

Still it should be less of an issue with TV shows on Blu-ray (recorded on film or HD video cameras). Though chances are they'll be more likely to always use 24p instead of 60i/p