Need feedback about Pro Sites + Pay to Blog

Hello again heroes!

I need further information about the best way to block both Front-End and Back-End to client's who don't pay for the plan. FYI, we are also using the default Free plan.

I see there are two options to block blogs. The first one is on Pro Sites Settings, where we can redirect the user to subscribe page. The second one is using Pay to Blog.

Could you give me some feedback about the best way to do this?

Another question: from our tests, if one Admin of several blogs, have one of the subscriptions expired, he won't be able to access any blog. Shouldn't this user get block only for expired subscriptions?

Maybe I'm missing something here. Thanks for your help!