Dear or dear, where did you learn to spell, Dan..? You don't even know what is correct, so you're having to check. I actually don't need to. I learned correct spelling.
I have an English Language A-Level, not the most glamorous qualification but I learnt (despite both being correct, it's more commonly used in UK than 'learned', which by your standards is important so I suggest you correct yourself) that -ize is standard by OED definitions. I use -ise out of habit and because I don't give a toss for extreme levels of pedantry. Also shouldn't you say "you don't even know which is correct"? Nah, I'm sure you know.