Which way to finish suspension parts - Powder coar or POR-15?

I was wondering what experiences or recommendations you have for finishing off suspension and chassis parts. I plan to sand blast and coat my K frame, sway bar, cross member, steering linkage, upper and lower control arms, ... and was considering POR 15 or powder coating. Which will last longer, prevent moisture damage and be better at the abuse of use on the street? Hopefully I will never have to do this again for a long time.

Thanks