Good contrast in the two cars. If I am not mistaken it is an accessory belt not a timing belt. The former I just had replaced a few months ago. Not major $$$ or much work to replace.
High mileage vs. low mileage. The low mileage car has less wear and tear on the accessories, namely water pump, coolant reservoir, aos etc. The higher mileage car may not have had the accessories replaced. It would be good to get service history on both cars but with a dealer it may be harder.
Year 2000S as mentioned above it is a better designed IMS. However read up about ims and "buying a boxster" in this forum.
Either way you go it is good to put $$$$ aside in case of problems. Either car is a major discount from original purchase price.
As mentioned above get a PPI done on the one you like. Any problems found can be renegotiated in the price.
Enjoy the ride!
G.