CRT.5 conversion Need advice

[Shark413]

I should be getting my CRT.5 roller soon and will convert it over to brushless power. I will be using a Mamba Max with a MM 5700 motor and a Maxamp 3s lipo. My question is should I go for a 5000mah or an 6000mah lipo? I want to keep the as truggy light as possible because it is pretty small, but is the extra 1000mah worth the extra 100oz? The 5000mah 3S is 345grams and the 6000mah is 443grams.