hoshi

I personally think the S5 IS should be a good choice.
  
Although some Fuji's might have less noise in low light shots,
Canon S5 IS has optical IS which is useful for shooting indoor.  
In additional I always feel Canon's photos tend to retain more
details partly because of the less aggressive NR algorithms
(you can compare what Panasonic does to totally ruin low light shots).

Also for the S5 IS because it is not a card-sized camera
it is always easier to hold it more steady than other lighter cameras.

Just my $0.02