Completely different. If its your first time and you are mostly doing tourist things the JW Marriott is nice but also a very busy tourist hotel. With that comes good and bad. Hyatt location is much more in the business district and is much quieter with better traffic. I find the service and staff at Hyatt better overall, but mostly the pricing is around 1/3 - 1/2 as much with my corporate rates. The savings is well worth it to me. Its not a very far ride via uber to Miraflores for the times I want to go there. What are you looking for?