Content upgrades delivery question.

Hi guys,

how are you doing today?

I am preparing a huge amount of content upgrade offers to one of my sites and want to understand what in your opinion is the best approach.

My goal is to deliver the content upgrades offers (ex. e-book, checklist, etc) with the less hassle in the process.

I know that i can use double step optin form to verify if the user is autentique (at least he needs to validate his email) in order to receive the freebie.

The issue is that i need to create 1 group for every offer i create to send the automatically to the prospect.

The other way around is to solve the huge amount of time is to use the single step optin form and deliver the content in the thank you page.

The second option seems to be the fastest one to deliver content upgrades but i am quite worried the majority of the people will fill fake email addresses just to grab the content upgrades and then they will be useless for my email marketing campaigns.

For you guys who are quite used with this what is your honest opinion about both of the strategies?

What is the one that suits you best?

Thanks in advance,
Paulo