Need help to choose VPN or Proxy for CL posting

I need to make choice for craigslist posting purposes.

I have service for US Dynamic VPN account with 32 IP at around $30/month

or

I have 50 shared private proxy service at around $30/month

which way should I go.. I would appreciate for any input/opinion.

Actually what services are you referring to?
At those prices i'm interested to use it as well.

I've used a VPN solution in the past, but it was limited to one IP only.
But i had great experiences with VPN, a good and fast connection on hand at any time when i needed it.