Wait for a New Design
With the larger 16-inch MacBook Pro Apple made the notebook a little thicker to add in an hour of battery life and made the notebook slightly larger to handle the display.
If you are looking at the 13-inch MacBook Pro, hold off to see if the 2020 MacBook Pro sees a similar change to add battery life and even a 14-inch display. This isn't a given, but we expect some of the changes to carry over.
If you want a larger model you should simply buy the late 2019 Macbook Pro 16, but if you are focused on a 13-inch MacBook Pro hold off for now.