I've been using Linux for a couple of years now. My first Linux OS was Ubuntu, and since then I used Lubuntu, Xubuntu, Arch Linux, openSUSE and Debian. My computer specs are the following (really bad PC, by the way):
Intel Celeron CPU @ 2.8 GHz (32- and 64-bit capable), 1512 MB (1.5 GB) of RAM memory and an NVidia GeForce 6200 GPU
Ubuntu and openSUSE were usable, but pretty sluggish. Debian, Lubuntu, Xubuntu and Arch were always pretty fast and smooth (at least to a 9 year old computer). All of them were always 32-bit (i386).
My question, is there any advantage for me to use a 64-bit version of, say, Lubuntu? What are the pros of a 64-bit system besides being able to access more than 2/3 GB of RAM? Will it improve my performance? I don't care having a bit less free RAM memory, since Lubuntu/Xubuntu always stay around 150~250 MB.