Here is a comparison of the two minifigures:
LEGO surfer:
* Pros:
* Relaxed and casual appearance
* Perfect for beach-themed dioramas
* Comes with a surfboard and other accessories
* Cons:
* May not be as visually interesting as the disco dude
* Can be difficult to stand up on its own
LEGO disco dude:
* Pros:
* Flashy and eye-catching appearance
* Perfect for disco-themed dioramas
* Comes with a boombox and other accessories
* Cons:
* May not be as versatile as the surfer
* Can be difficult to pose dynamically
Ultimately, the best LEGO minifigure is the one that you like the most. If you are looking for a relaxed, beachy minifigure, then the surfer is a great option. If you are looking for a flashy, retro minifigure, then the disco dude is a great choice.