It will be up to you as to which one you like best. If you are keeping both than you can use either depending on the task.
I have both but have only really used the newer one I have with the aluminum table with fence, extension and circle cutter. I do like those features. I only recently bought and restored a 1956 Greenie Band Saw which still need one item finished. It does not have any upgrades except new bearings.
Mark V completely upgraded to Mark 7
Mark V 520
All SPT's & 2 Power Stations
Model 10ER S/N R64000 first one I restored on bench w/ metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ metal ends & retractable casters.