If in doubt simply log both. Even EASA talks about logging IMC/IF time, although only in the remarks column as it is not needed for anything in euroland.
Personally i don't bother with that, but i do have a job in europe. During training in the US of course i did log both, IF time in my FAA log book and IFR time in my german (JAA didn't apply to us back then) log book.