Advice on which Nurse Assistant Position To Choose

Was curious if you guys could help me out in deciding which Nursing Assistant position to choose if I'm offered the position. Pediactric Cardiology unit or Neurosurgery unit?

Now my main career goals are to be come a critical care nurse in an ICU - CVICU or SICU. Once I get to that point am really interested in CRNA school.

I'm just trying to figure out which unit would best prepare me for critical care nursing.

Thank you!

-Shaun