I've measured, that at least in my case for OnPodium, having yearly plan selected by default increases new yearly subscriptions about 80% comparing to preselected monthly. At the same time I see 40% increase of not finished free trial starts (people see the final price on the Stripe checkout page when adding CC).
Yearly PROS:
Yearly CONS:
I have preselected yearly again. The next experiment I will move forward with is to show annual price right on the pricing page, instead of showing price per month (as everybody does :D). Will see how bounce rate will increase on my pricing page.
What are your thoughts on this?