64 pitch is smooth and silent compared to 48 pitch but wouldnt recommend 64 if running in a parking lot or dirty dusty tracks.
48 is great for messing around and parking lot racing.
Also if going brushless would recommend 48 pitch jsut for strength.
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0