The logo polo shirt is one of the major cash cows for the menswear industry. Men will invest and spend large somes on particular designer's shirts. Once dominated by a few large players - you know who they are! - now every brand worth their salt has a cute little logo or monogram and choice of colours.
If I was going to recommend a brand to buy over all the others, I would say Moncler. They are a bit more expensive but the quality is there. The fabrication is so good and the brand is still being picked up on so it hasn't had over kill yet.