FWIW I would opt for OOBR. Like you, we spend almost all of the beach days at Orient and the relatively short 15 minute drive gives us the opportunity to take a break from the sun mid-day if needed. The resort is back to better than pre-Irma state. I've tried staying at Simpson Bay and the drive often is very long...if you hit traffic at the wrong time.
True, there are not a lot of dining options available other than in the resort itself but for evening dining the trip to have dinner out in Simpson Bay is a lot easier than fighting the traffic during rush hours.
For me, the seaweed at Dawn Beach presents no problem since I don't go there. I'd rather enjoy the beach at Orient. Be doing that in September.
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