I am currently building a formula 1 3racing f113 and I need it to have a high top end speed. I am currently looking at either the castle 1406 7700kv with a 5200mah 2s 7.2v 30c battery, or I am looking at a castle 1406 5700kv motor with a 5000mah 11.1v 3s 30c. Which is better?