when i asked veena about this she said she likes both 45 better for things like spinning faster and certain mounts (pencil/jade/iguana whatever you refer to it as from floor) but things like jade split hurt alot more as there is a smaller pont of pressure think of a skinny bar being pressed into your chest compared to a 4×4 size bar with the bigger object the pressure is distibuted more evenly as oppsed to being so concentrated at 1 point i think 50 is better unless you have really small hands as learning on a 45 than trying to do it on a standard 50 can be difficult