Re Oregon coast v. Monterey, well you're really only talking the courses at Bandon v. those in Monterey. So if you want to base this in reality, it comes down to those three v. the greater quantity to the south. Also, the terrain and turf issues vary greatly from course to course in Monterey, so it's not really a viable question.
But with all those caveats, what the hell I'll take a stab at it.
Turf - Bandon. Firmer, better, sandy base. In Monterey, the only courses that have this are Bayonet and Blackhorse - all of the more famous ones are clay-based and are soft and wet for long parts of the year.
Weather - I have to go with Monterey. Changing conditions are neat, but it's not like Monterey is always the same. But most importantly, there's just plain not as much rain. Rain and golf are a tolerance, not a choice.