Roundel is the club newsletter for the BMWCCA. I don't know what the Canada chapter calls theirs. I'm not a big fan myself, as it's hit or miss. Like Bimmer, they seem afraid of saying anything too negative about the new cars. Where Bimmer shines is finding interesting older cars and projects, same as their sister mag Excellence.
My current favorite is BMW Car from the UK. Performance BMW focuses on heavily modified cars and I often feel the money was a waste. Total BMW, sister mag to PBMW) is good, focusing mostly on well-kept older cars and keeping such cars in good shape.