Foam or Innerspring (Marshall Unit) Cushions?

My wife and I are buying a Bernhardt sofa at a local furniture store in Austin, TX. We can choose between foam core cushions and innerspring core cushions at the same price. We tried both in the store, and hey both feel about the same comfort level and provide similar support. I guess it really comes down to which one will last longer. Do you have any advice? I am about 300 pounds, so durability is a key.

I realize Bernhardt is not the "best", but for our price range, we feel like it is a good choice for us. The sofa with the sale deals factored in comes out to about $1400 before tax. Thanks.

Get whatever feels the best to you. Lifespan of the core will not vary by much.

Thanks Duane. That is what I was hoping to hear. I'm just going to tell my wife to order the one she feels most comfortable on.