If you are planning on generating rental income, the indoor pool may have a higher desirability for a tenant. On rainy days, and in off season times, the pool can still be used.
There are many factors to consider in comparing properties/buildings. Both are newer masonry buildings (masonry is preferred for insurance purposes), as well as street location.. ie - Adagio is located right as you come across the Route 90 bridge. Mayfair Beach is considered North Ocean City closer to Delaware line. Properties in North Ocean City have sometimes garnered a higher price.
If I can help, please let me know.
My best from the beach.