With a 4500psi fibre cylinder on the gun acting as your stock the round base lets you roll the gun in your shoulder
A 3000psi aluminium/steel cylinder has a flat base, you can still do the moves but its less natural to roll
However there is much more for personal preference. Rather then being about weight balance and a natural feel do more for an individual
You can switch hands with a remote line - not as fast as you could with a speedball marker that can be flicked back and forth, but a speedball field differs from a woodsball field. In speedball you are on a restricted but open area - you expect everyone to know where you are and can be quickly covering both sides of a bunker. In woodsball the field is normally bigger and views are obstructed, you can still be caught defending a bunker
Swapping arms is easily done with a remote line long enough to reach accross your chest. This then means you have more cable hanging from your body. It could get caught in bushes, but with spacial awareness is no more of an issue then your pod belt, gun etc getting caught in a bush