Clear bra's are awesome if done correctly (be advised the installer is the greatest variable you have). Honestly I'd do both, but I would just skip the opti-coat on the portions that the clear bra is put on. Because the opti-coat can only be bonded to a clean paint surface so the clear bra would go over it, but there's no real point because the clear bra has much more protection than opti-coat will.
And like glen said, you still have to use proper wash/dry techniques to keep your paint in good shape. Just a simple 2BM or rinseless wash with quality products and your paint should look like glass all day.