It used to give you a list you could choose from and now it’s gone .

I am a business seller (no simple delivery), and use eBay labels.  When I enter the weight, I'm given three options and the top one is frequently Yodel.

At the bottom of the list you see a link that says something like 'See All Services'.  When you click that you will see the full list of all the carriers used by PackLink and all the RM services.  You can then choose the one you want.