score:4
When I was young I was tormented by many false teachers so I looked the guy up for you. Derek Prince looks like a not so bad guy among some pretty bad ones. Β Yet he also seems pretty bad under the names you provided.
As an Arminian with a very strong almost hyper Charismatic bent and bizarre over emphasis and horrible obsession with demonic activity, you can be sure people like John Piper and John MacArthur would throw up red flags all over.
To show how this guy is at his worst he claims to have cast seventy some demons out of a woman and each demon had a name of a false doctrine, and one was called 'eternal security.' Well that is more or less saying Calvinism is demonic and Piper and MacArthur are in bondage to demonic heresies.
Anyway safe to say,Β I would stick to more mainstream people as you mentioned. They would not get along with this guy. To supplement people like Piper and MacArthur I would also find out what older Bible commentaries they like to read and read one. Christian books are ok, but Christian Bible commentaries are generally much, much better.
Note: I found almost your same question and a few insightful responses here while I was looking.