Disclaimer: I'm a beginner
Samples are hard to find but easier to process. Usually it's already a clean recording and saves you all the hassle of getting a perfect sound and recording a guitar. But at the same time it gives you (at least me) a feeling that you cheated. Using my own guitar and playing is much more rewarding to me.
Ideally I would like to record everything by myself, when I have enough time for it in the future.