Looking to fly MCT-DXB on Oman Air next year and debating between Y and J because it is such a short flight. Outside of the stuff on the plane itself, can someone help answer these questions:

1) What options are available for priority lanes in each airport? I'm assuming there is priority check-in at MCT, but is there priority security & baggage there? How about (most importantly to me) immigration/customs in DXB? Do any of these regularly save more than 1-2 minutes vs the standard line?
2) Primeclass lounge looks fairly nice (I have access through PP), is the Oman Air business lounge materially better in any way?