For traction, should I focus in the quantity or quality of my waiting list?

I'm building the landing page for my mobile app that is going to be available in three or four weeks.

For the user subscription section of the landing page, I'm using mailchimp, but they use double opt-in. Checking out other landing pages about apps, I notice that the majority use simple opt-in when a user subscribe to their waiting list.

My concern is about should I send a confirmation email after a user subscribe to my list to validate that email or shouldn't do I?

If they need to validate their email, I'm adding friction to the process and some users may no complete the process, but the ones that do, would be people who really want to use the app.

If they only subscribe without confirming their email, the number of subscribers to the waiting list probably will be larger but some emails will be false ones or duplicated ones.

Which one would be better to implement for better traction results?

Hope you can help me.