I don't even think of comfort when evaluating strings - I play everything from bass to uke and play steel-string guitar so "comfort" of any soft string is pretty much irrelevant. In fact, I usually use "over gage" strings (tenors on concerts, etc.) because uke strings feel so soft, like I'm going to tangle my fingers in them.
The Golds intonate as well as any other strings - meaning on some ukes they'll be great and on others less great. You can't consider strings in isolation. Every uke I own has had at least a half-dozen different kinds of strings tried on it, some more than that. When I find a string set (sometimes by mixing strings) that intonates well and sounds good, that's what goes on that uke thereafter. Currently I have ukes with Ko'Olau Gold, Ko'Olau Alohi, various mixes of fluorocarbon fishing leader, Aquila Nylgut, various classical guitar strings, and Worth clears. Whatever a particular uke needs, it (eventually) gets. LOL
As for tone and sustain - the Golds are quite good on ukes that need a subtle string - they can be downright muddy on a uke that needs brightening. Again, strings and uke must work together, and there aren't any magic bullets.
Oh, on intonation - I have found that usually strings that are higher in tension intonate better up the neck. This is another reason I use "over gage" strings.
John