Which refresh rate should I choose?

i have 2011 mac mini connected 42" toshiba tv. in lion's system prefs, have resolution set 1080p, choices have refresh rate 24hz, 50hz (pal) , 60hz (ntsc). should choose?

use mac mini purely media centre (running plex in full screen). i'm in uk, , tv capable of 100hz.

 

uk. use pal.

http://en.wikipedia.org/wiki/file:pal-ntsc-secam.svg

ohh , @ 50hz

 

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