304290,
The differences between natural and synthetic and blended have been discussed quite a bit here on the forum previously. You may like reading this post.
As for choosing online or local, that’s again something that would come down to your own personal preference (the 20% price difference was an opinion Phoenix previously posted here on the forum), and something you’d just want to weigh with your own pro/con list. It sounds like you’re considering good quality materials, so that’s a great start, but in the end only you can make that final choice of where to source your product and what’s most important to you.
Good luck in your choice!
Jeff Scheuer, The Beducator
Beducation / Mattress To Go