This comes close to my opinion. I think personal preferences (guided by experience) pay the largest part. However, players do tend to prefer more detailed rules than GMs.Henry said:It truly comes down to individual preference, but as a general rule I've found that players prefer lots of explicit options in a system, and DMs prefer a lot less explicit options and more control over the rule boundaries.
Why? In my opinion, it's because DMs have a lot more info to keep track of, so they prefer simpler or more ad hoc options. Players, however, have only one thing to track -- their characters, and how these characters are impacted by the game world. Therefore, they're going to want more to control, more to have input on, more to manage to avoid boredom with both character and game world.
Gundark said:I really had to fight to get Spycraft to be my modern gaming system (as opposed to d20 modern which again certain players have a lot of the books).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.