I haven't posted in a long time (work, business trip, work...rinse, lather, repeat).

Does anyone have experience how pairing two water resistant layers works in extended or heavy rain? I did a pretty successful shower test, but here in CA there's no way to test in in real weather right now.
I'm going on a month long trip through Tibet, China, and Nepal and I'm torn between two outerwear choices: 9oz micro fleece or poly jacket+11oz event jacket, or 15oz Powershield hoody+ 5oz nylon windbreaker. Since the temps vary so much, I'd prefer the second one, but I'm worried what happens if I get caught in some extended rain. No climbing, but some 2-3 days hikes.