I had a pair of s-38’s, but not the beech ones which I liked a lot. IMO the 530’s might be slightly better due to the compression driver, but the 38’s have a pretty good French sourced titanium tweeter and an 8” woofer. The person I sold them to said that he has experienced both studio lines and they are more similar than not. Both were designed by Greg Timbers, famous JBL designer.
Just curious, why you’re replacing the 38’s. They’re not be all end all, but are pretty good.