That's like having ham or eggs for breakfast. I'd get him both. The. As a matter of fact, my preference would be for "Raising Trophy Bass" and the subscription.
I'd buy both for some good reasons. First is that the books are a wonderful kick off spot for knowledge. Then the magazine answers things that, after years, I still don't know enough to ask.
Next, it's his pond. You need to stay on his good side.