If all you have is those two computers, and you don't need to share much between them (remember, you can always transfer data with the use of a memory stick costing next to nothing - these days you get them as giveaways), then I would opt for the print share box.   Yes, it is a physical box, it's small and cheap. Don't bother with setting up a network, it adds a level of complexity you can probably do without, and increases the risk of exposure to nasties for the machines.

The KISS (keep it simple, stupid) principle holds true in all circumstances.