6s lipo: 4500-30c or 5000-25c?

I am looking at two different lipo's from the same brand for my X2-CRT. The truck has the cc-neu 1518.

These are the specs of the lipo's I'm looking at:
6s30c4500mah: 135a cont - 270a burst, 784gr., max 4c charge
6s25c5000mah: 125a cont - 250a burst, 773gr., max 4c charge

Based on the c-rating the 4500mah pack would be the better choice. But I have no idea how many amps my setup will pull (geared for 39mph without ballooning calculated).

I only bash and wonder if either lipo would make any difference compared to the other?