What is Gabe Newell's favorite class in Team Fortress 2?

Gabe Newell's favorite class in Team Fortress 2 is speculated to be the Spy. This belief is supported by the fact that Newell has mentioned playing as the Spy and enjoying the tactical and stealthy gameplay it offers. Being the co-founder and managing director of Valve Corporation, the development studio behind Team Fortress 2, it is likely that Newell has a deep understanding and appreciation for the unique gameplay that the Spy class brings to the game.