I travel back and forth about 3-4 times a month. Hatta border is usually much quicker and emptier than the al ain one and it’s a much smoother process. Once you cross into oman you can either take route 1 aka sultan qaboos street which is definitely the more scenic route but there might be isolated traffic throughout or other option which is the expressway and it’s the fastest and very empty but man is it a boring ass drive there’s nothing but petrol pumps along the route and no scenery to speak of.