If you haven't measured yet, how do you know you need one at all, and if you do need one, the (your) measurement vs the specs will tell you which....THAT'S why the specs are published.....
Don't mean to be harsh, but that's why we measure to specs instead of just assuming "tightest" is best...Often, there are allowances built-in for thermal expansion, and tight may be too tight once the engine is warmed up.......
By all means, order "both" if you don't want to bother measuring first, but fit the one that meets specs.....