i think it's a myth that heavier string guages give better sounds,
evidence wise, jeff beck and jimmy page always used very light strings, in fact beck favoured 8's, and they sounded alright!!!
steve vai uses 9's, Diamond (dimebag) Darrel used a set of 9's, do either of them sound soft???
i must admit, i generally use 10'a myself, but i have 9's on a couple of guitars and they sound just fine. i use 10's on gibson scale lengths, and 9's on 25,5", but on 25", PRS etc. scale, i have a mix of 10's and 9's
it's all personal taste, isn't it?
How do you know?
I mean, you mention guys that use *blah* guage, but how would you know what they sound like with a different guage? I'm sure they tried em and made their minds up, but you've only heard them using what they use, in amongst all the other stuff they use.
Sorry, but thats not evidence. Evidence would be showing that they make no difference while keeping everything else the same in a setup.
I mean, in Eb slayer use 9-42, and it sounds heavy because they use modded silly-power marshalls...but how would it sound if they played reign in blood with 10-52? Kerry and Jeff probably know, but not you or I.
I've tried many string guages. Almost all that there are (8-38 (didnt last long!), 9-42, 9-46, 10-46, 9.5-48, 10-52, 11-50, 12-54, 11-53, 10-60, 11-60, 10-70, 13-70 adn a couple of wound 4th sets that I gave a chance for 10 minutes that werent that different at the extremities but have forgotten have all passed through my electrics. Some stayed), and it makes a HUGE difference.
HUGE.
And yes, its all prefference. But please dont try to tell us that string guage makes little difference. It doesnt change the
character of your tone (though string brand will!) but it will change your tone a lot!