As a subscriber to no less than four bowling magazines,
Bowling This Month (
BTM),
Bowlers Journal International (
BJI), Bowling Digest, and ABC's Bowling
magazine, I think that the best all around is
BJI.
BTM has the most detailed reviews of balls and some really good instructional articles. Bowling Digest is good for beginner instruction and gneral info. Bowling
magazine deals mostly with the administrative side of bowling but does have some good bowling tips. Personally, I don't think you can go wrong with any one of these. It all depends upon where your interests lie.