Hey Mad Max
If you plan on taking one to Koh Samet and making a good impression, i.e. lots of selfie opportunities, then I'd recommend one of the 3 higher end resorts on Ao Phrae.
They looked very nice, but the beach isn't so nice.
However, the 3 LBs I was with all preferred these 3 to Ao Wongduean and called me a "Cheap Charlie" a few times, which made me laugh!
Another suggestion for a more romantic getaway way would be Wongduean Resort at the other end of Ao Wongduean beach, which also looked very nice.
Cheers
SAG