Bradington Young - Which seat cushion?

I am looking at buying a BY sofa in grade 5 leather. Which seat cushion is recommended: HR foam, spring down, or premier down? Are the cushions replaceable at some point down the road?

I have the BY Melbourne sofa with the premier down seat cushion. It is comfy but there is some puddling of the cushion that gets the most use. I've had it 1 year.

The H&M Arrington sofa that I sat on in the store was by far the most comfy cushion I've ever sat on. I believe it was the H&M standard cushion.

The BY Premier Cushion is their top-of-the-line unit but will show puddling like all combination down cushions. You can downgrade the cushions to HR Foam at no charge if you like and that will keep its shape better. In many of their pieces the Premier Down is standard. Bradington Young generally will replace any seat cushion that has lost its resiliency free of charge to the original owner if you pay the shipping. That offer does not apply to back cushions.