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What about the age of the pitcher? At 9/10U, how many pitches should they have? At 11/12U? Etc. My dd has two and has been pitching since April. FB is good. Working on change up. Change up speed is good, hitting the spot no so much.
A pitching coach used to tell us "You never want to get beat on your 4th or 5th best pitch." This really applies to any pitch that is not as effective/reliable as your best pitches. Gary Haning's OC Batbusters won 18 Gold Nationals more than once with pitchers that only threw 2 pitches, but they owned those pitches and rarely missed their location by more than an inch.
A good FB and an offspeed are enough for 10u @ 35'. Many of the people that claim to throw other pitches at that age/distance aren't really getting enough movement to make a difference - they're just FBs by another name. I know my DDs curve and screw at that age were mainly a different angle from striding to the opposite side of the target.
It's easier to get movement on pitches at the longer distances. My preference is some sort of drop, but it depends on the girl - some pitches come easier than others. I recommend trying them - curve, drop and screw - and working on the one that seems the most promising. Riseballs don't really get the 'rise' effect until they're throwing 55-57 mph.