The big, obvious advantage to Google Sheets is that it's free. If you have a Google account, then you already have Google Sheets, sitting there making puppy eyes at you, just waiting for you to come home.
And you should, because Google Sheets is great for collaboration. With Excel, you have to mail every client (or co-worker, or Dungeons & Dragons participant) a separate copy and then consolidate at some later date. With Google Sheets, everyone sees the exact same sheet, since it lives in the cloud.
But perhaps most importantly, Google Sheets is convenient. It may not have all the flashy features that Excel offers, but that makes it far more straightforward to use and easier to explain. If you want to change something, it's likely easy enough for a baby to do. And if you do run into a problem (like if you're working with a particularly dumb baby), you can set up a quick chat window to help work it all out. Of course, the best way to fully take advantage of this program is to take a class that explains all of its important qualities and nuances. So if that's your bag, pick up the Master Google Sheets training kit now, available in the Cracked Store for just $18 (that's 93 percent off its original price of $297).