I prefer Emain. It's home to spiders that aren't messed with (unlike in Tir graveyard), sheep that are easily stuck, and the holy water part-time is pretty easy. There's a cooking part-time in the Restaurant, too, which is good for training cooking at earlier ranks. On the downsides, there aren't herbs close by, and most of the part-times aren't exactly unique.. It's also harder to stack/complete several part-times in a row in Emain, too.
Dunbarton has plenty of nice part-times, but.. Kristell's annoys me. Either potatoes, eggs, or apples for holy water... Apples are annoying for me to get. 8D If a town doesn't have an easy holy water part-time.. Then it automatically gets crossed off my list for favorite town! : P