Just looking at them I would go with the Rotel. The MMF is basically a piece of MDF with veneer and some holes drilled in it. Its belt drive which is fine but it has a built-in phono stage. So part of the budget went into a cheap phono stage card which whatever that amount was the one thing we know is it didn't go into the tone arm, motor, platter, etc.
The spare cartridge will be nice, if for nothing else than to try it and learn a little about the differences between cartridges. Good practice mounting/aligning. The Rotel is direct drive so no worries about replacing an old belt. Ask about bearing lube. Main thing on some of these older tables, the bearing oil can go dry after many years. Same for the tone arm. Basically if you set it to zero VTF zero anti-skate it should float smooth and not stick. If all that checks out and you like the way it looks go for it. You will be buying a fully depreciated table that will hold its value many years.
For best sound quality avoid receivers like the plague. Find a good integrated, either with a built-in phono stage or buy one separate. Either way will be light years better than the one in the MMF.