The 70-300 would be the better of the 2 lens, and the better reach will be and advantage for shooting baseball and soccer if you are close to the field. It is the great jack of all trades lens.
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.