'Direction' Pronunciation [duplicate]

I'm a nonnative speaker of English and I've always been unsure about the pronunciation of "i" inside words like direct, organization, etc. I was thinking that it's a matter of choice between American and British usage to pronounce that "i" as ɪ or aɪ, or even ə, but looking at some dictionaries made the situation more complex for me. For instance, MacMillan dictionary gives the American English pronunciation of "indirect" as

/ˌɪndɪˈrekt/
/ˌɪndaɪˈrekt/

whereas the British English pronunciation is given as

/ˌɪndəˈrekt/
/ˌɪndaɪˈrekt/

So both of them include two versions and ɪndaɪrekt in common. I thought that only British English had ɪndaɪrekt.

The same dictionary given the pronunciation of "organization" as /ˌɔrɡənɪˈzeɪʃ(ə)n/ for American English and /ˌɔː(r)ɡənaɪˈzeɪʃ(ə)n/ for British English.

Is there a prevailing rule in international English for this kind of pronunciation? What do native speakers think and suggest?

As far as I'm aware, this is essentially a US vs. UK difference. Other examples where UK English has a /aɪ/ vowel and US English has a schwa include "missile", "volatile", "hostile", etc. which in the US effectively tend to be pronounced as through written "mis(t)le", "volatle", "hostle", etc.

In English, in a non-stressed syllable, a schwa often replaces the vowel. This is what is going on here. The second syllable of both indirect and organization is not stressed. In this word, it is acceptable to replace the /aɪ/ with a schwa. And in some American dialects, when you replace an /aɪ/ with a schwa, what you get is typically an /ɪ/ and not an /ə/.

All three of these pronunciations are pretty much interchangeable to a native English speaker's ear. Pick one, and don't worry about it. Native English speakers generally only pay close attention to the vowels in syllables with primary or secondary stress.