BGS online for me… but make sure the country where you plan on taking the writtens will accept BGS… I had to go to NL to do my writtens as Denmark would not accept giving you the exams UNLESS you had take the theory in a Danish school.
remember, the EQB is super secret and apart from knowing the theory, you wont pass anymore by memorising answers because NONE of the online sources or apps have the actual questions.. Also the questions are written in bad english, put thru google translate 4 times so some answers have both a correct answer and a more-correct answer.
If you download the FCL you will find the Learning Objectives which almost get quoted in the answers so thats the source material despite what all the app try to tell you.