You'll be fine with the 10 spline
The 24 are stronger as the force is distributed more evenly throught the shaft BUT they still snap!
Personally I run 24 but I do comps and run a locker with Simex ET's.
The other big advantage of 10 spline is that they are much much easy to get your hands on when you need a spare and alot cheaper.
Stick with 10, you'll be fine