I downloaded a book from this site, Greek grammar by William W. Goodwin. It is written that you read diphtong "eu" as "eu" in feud (so /ju/). But in an other grammar I found that you read it like /eu/.
In that other grammar is written that diphtong "ei" is written just like that, /ei/. But, in this grammar by William W. Goodwin, it is explained about it, first it was /ei/, and then /i:/. So, I'm asking, what would be better to use, or what do you prefer?