I prefer to work with scorers and timers who are female and attractive.
However, I mostly prefer to work with scorers and timers who are there. It is frustrating to be at the table before the game, doing your admin chores, and the timer or scorer is off eating a hotdog and chatting with friends.
In my area, these are paid positions (per game) for all Varsity contests. The same people usually do them for every home game. Consequently, they are usually experienced. That doesn't mean they know everything but it does mean that a quick chat and intro before the game typically makes for a smooth game.