Not only roads but vacation experience. I'm sure you don't want to spend your vacation in constant rain. Closer to Ubud would be much better but I would try to get as close to the coast as possible.
Thanks for the advice.
We chose Ubud b/c we'll be in Thailand prior, and will on beaches there. We're looking for a change of pace.
Rain wise, it seems like it rains around half the days in Ubud in December. If it comes down to it, we could always do activities close to the coast during the day. Bali isn't such a big place.