It takes less time to mount something in a Clam Shell Style Press (500T).
Vacuum Presses take longer, as the pressure needs to drop with the press hot, and the art inside.
This makes them potentially less safe for heat sensitive items.
The 26x32 size of a 500T is large enough for the majority of what we mount, but it can be tedious to mount something large.
Maintenance on a Clam Shell is easier as well, as the only thing that is likely to go off is the thermostat,
Vacuum Presses require a good seal, which can be hard to obtain if you purchase a used model.
Having both can be helpful, but I'd start with a Clam Shell.
Side note is there a good standard term for the 500T style press?
Heat Press is misleading, as most Vacuum Presses are heated.
Screw Down Hard Bed? Clam Shell? Mechanical Press?
Brian