A lot of LCD computer displays are locked at 60FPS*, so 30FPS fits best, fitting one animation frame perfectly into two display frames. 30FPS should look smoother than 24FPS or even 35FPS.

Fitting non-perfect frame rates can lead to juddering effects, as some kind of pulldown method is needed.

2:3 Pulldown used for movies shown on TV in the US

I'd use a frame rate that's perfectly divisible 60FPS. That means 15, 30 or 60FPS.

If, like Ben suggested, you're outputting to be displayed somewhere else and/or via a file, a different frame rate might be better.

Also, depending on your needs and requirements, you may want to reassess the use of Flash at all at some point soon — Flash's future looks pretty grim as a web format.

*I believe almost all flavours of OS X and Windows use 60FPS as the default LCD frame rate. Linux can apparently use other values easily, but 60FPS is still by far the most common frame rate for computers, including iPads and iPhones.

Flash 24fps vs 30fps
We suppose for semplicity to have a 1D oscillator, but this is a question abaout the general CCR algebra in oscillators, second quantization, quantum field theory etc. 
We know coherent states are a non orthonormal base and are a overcomplete base.
We know them are given from $A |\alpha&gt;=\alpha |\alpha&gt;$. where $|\alpha&gt;=e^{-\frac{|\alpha|^2}{2}} e^{\alpha A^+} \Psi_0$

How can we calculate generical scalar product between two different coherent states with eigenvalue $\alpha$ and $\beta$?

$$
e^{-\frac{|\alpha|^2+|\beta|^2}{2}}\Psi_0  e^{\beta A} e^{\alpha A^+} \Psi_0
$$
