Question
Our site is built on Hubspot's COS and now we are thinking of trimming the fat, migrating to wordpress (way more flexibility for design), and then using Infusionsoft for our content offers, emails, etc.
Answer
The following page provides quiet a useful comparison between hubspot and infusionsoft:
https://www.g2crowd.com/compare/hubspot-vs-infusionsoft
It provides comparison between pricing, services and customer reviews.
I hope this provides you with some useful insight for your business decision.
Regards
Imran