Having been to both, I was very worried about Oman. It's close to UAE and while the UAE is generally very flat, Oman is quite mountainous - so this much water would be amplified in the valleys and ravines between rises. It looks like Oman+UAE have had 20 deaths confirmed so far, with 18 of those being in Oman.
Geographically, driving around Muscat (capital of Oman, where mountains run right up to the ocean coastline) feels a lot like driving around Austin, very windy and hilly roads with lots of greenery in an arid climate. Culturally, Muscat is a really beautiful city, much more friendly and laid back and colorful than the rest of the Gulf (vs. Saudi/Bahrain/Qatar/UAE/Kuwait).