It's always my goal to compose and print full frame, but I will not hesitate to crop in printing when it lends an advantage to the composition. I know that primes are always the best in any format and I use them whenever I can, but for 35mm especially, zooms are a very useful tool for composing full frame when the subject and shooting situation are anything but sedentary. I find that in most cases, the advantage in image quality that I get in being able to print full frame by using a high quality zoom outweighs the benefit of using a prime but having to crop later.

Best regards,