go with the pellets. You can either toss them in a nylon sock with sanitized marbles to weigh it down so you don't have to worry about filtering them out when bottling/kegging. Or you can just toss them in loose. Just tie a paint straining cloth to the bottom of your racking cain when your racking to bottling bucket or keg. I just threw some pellets into my IPA and about to throw some pellets into my APA. It also helps to cold crash your beer for at least 24 hours before transferring to help the hop particles sink to the bottom, making easier to rack. Pellets are fine for dry hopping.