This week, we're talking about two of the largest restaurant chains in the world - Subway and McDonald's. Both seem to have falling sales. But they are handling it differently.

McDonald's Canada made a few tweaks to their menu to big fanfare. But even the chain calls the changes not "hugely noticeable". They are focusing on the freshness and temperature of the beef in their sandwiches as a way to stem the tide.

Meanwhile, Subway is running a big test of Beyond Meat Meatball Subs. I used to love meatball subs. I will be first in line if they roll this out near me.

One chain doubles down on their existing business while another tries something new. Who will be the winner?