Helping Decide Between Upgrading My Sapphire Preserve or AMEX/Delta Gold

Hi everyone!

I recently got the Delta/AMEX gold in February of this year. After traveling several times in the last few months I again want to upgrade my traveling experience (looking at this time next year). For reference, I typically fly Delta and home airport is ATL. ATL primarily has the Sky Lounge and one recently built Centurion Lounge.

I also have had my Chase since 2022 and my credit score is 742. Would you recommend upgrading to the AMEX Platinum or Chase Sapphire Reserve?