Best placement for final BScN semester - ER ICU or CCU?

Hello,

What are the top 2 best placements for last semester of BScN: ER, ICU, CCU.

I need to pick two areas and I wish the areas picked to be the ones which would be best for my learning.

My preceptor said to pick critical care but I dont know if that would be ICU AND CCU.

Thank you