iFrame or Tokenization for Credit card transactions

My company is currently processing less than 4000 Credit Card transactions a year and we are a level 4 organization. I see that we are storing the credit card data in one of our databases but the PAN number is encrypted. After proposing either Tokenization or iFrame model to be implemented to reduce our PCI compliance to the management, the company heads wants to go for the iFrame model so we need not worry about PCI compliance at all.

Since we planned to implement iFrame for all credit Card Transactions, I would like to know how to implement iFrame as an automated processes without human intervention especially for recurring payments. I could not find any information for recurring payments using iFrame.

Also I would like to know if iFrame implementation is expensive than tokenization or vice versa. Any suggestions will be greatly appreciated.