If it's high-pitched I'll plug my laptop to the diamondtron (Trinitron clone) on the coffee table in front of my couch where "mplayer -speed 0.96" works a treat. Same sound equipment either way.
While I don't have a strong preference, given the choice I think I'd pick high-pitched because:
a) Kes is an artsy-fartsy film so I'm entitled to be snobbish about frame rate as well as pitch
b) the 17" diamondtron at close range generally looks better than the 16-year-old 20" telly across the room
c) by the reviews I've read it's a low-budget release -- 4:3 letterboxed, battered print, DVD5 -- so it's hard to imagine they spent the coin on the best software to do pitch-correction.
It's easy to imagine they haven't done any pitch-correction. But the thing is, I've previewed a couple of "online" copies (DivX & KVCD) and they just sound strange at 24fps. Such a deep voice from such a scrawny lad -- not only the main character but some of his mates as well.
I've just found some low bitrate MP3 samples from a website selling the soundtrack CD, so hopefully I'll be able to answer my own question when I compare them this weekend.