I do like synthetics, and I prefer them as travel brushes precisely because they dry out quickly. For me, one of the most prized attributes of a brush is its ability to retain the heat of the water I used to create the lather. I think badgers rank supreme there. I like boars as well, particularly once I've broken it in fully and the tips are super soft. But a boar, badger and synthetic all do feel different to me and I believe I could do a blind test and tell them apart.