Maighstir: "Which of the two"?
This is in Archlinux' AUR, so that's what I use.
I used to use the 64-bit version on Windows for a good while, since long before Mozilla switched to the current "Australis" interface, partially because I wanted a 64-bit browser that's not Internet Explorer (Opera, Firefox, and Google still only offer 32-bit executables on Windows, despite being 64-bit native on other platforms), and
I'd bet it was partially because I was uncertain wether or not Mozilla shared data collected through the browser (minor baseless paranoia), similar to why I had SRWare Iron installed instead of Google Chrome (I don't need every browser installed, just a sample of every major web engine in order to make sure code runs and looks well enough in all browsers; so Trident, Gecko, Webkit/Blink and Presto together with each browser's Javascript engine).
Nowadays, the main reason is that I don't like Australis.
Mozilla dont build (almost) 64 builds fr Windows for some reason
1) Their crash-report system somwhow cannot work with 64bit version, providing only bogus crashdumps. I heard they totally unhappy with that.
2) They use (dunno why) 32bit servers to build and compilers just crash with Out of Memory with compiling 64bit builds. They working on that for some time but it looks like it need very significant work to fix that issue
3) Windows, unfortunately, switching to 64 very slowly. VERY VERY. Mozilla almost dont have any win with 64bit winFirefox.
On other side, Linux switching to 64bit very quickly and much more easier - due OpenSource all distro maintainer need is to build 64 bit version for all packets and that works fine in most cases.
HypersomniacLive: Cheers, I'm also a Pale Moon and SWare Iron (portable) user on Windows. I'm planning on trying Linux and am interested in info on how well Pale Moon performs on it, as I'd love to keep it as my main browser there.
IMHO PaleMoon dont build it for Linux. There was SwiftFox before, analog of Palemoon, buts looks dead now.
BYW, if you planning to ise Firefox on linux you should know that there is two option - to use build made by Distro maintainer (like Ubuntu or so) or to use Mozilla's build. While usually distro-based is recommended i personally use Mozilla's own - easier to tinker with it.