Not quite sure I understand this…? What do you mean “an advantage over Android”?
Android is just the operating system made by Google, and Pixel is their own line of phones & tablets that run Android. So Pixels are the “purest” Androids you can find in the market, straight from Google. It’s kinda like how there are many brands of PCs that can run Windows, but Microsoft also makes their own “Surface” line of Windows PCs. Pixels are just Google’s own Android devices.
From there, other companies like Samsung and Lenovo also use their own modified versions of Android, usually a few versions behind the latest, and add their own UIs and app stores and bloatware on top of it. These can sometimes have better hardware (screens, CPUs, graphics cards, keyboards, etc.) than the Pixels, and can be both higher or lower price depending on specific brand and model.
Fire is a heavily modified version of Android, and in its particular case, Amazon decided to ditch the Google ecosystem altogether so they can have their own (and keep all the profits). I think the Barnes & Noble Nook is similar, except I’m pretty sure even that can access the Play Store. Most manufacturers aren’t big enough to ditch Google Play, but Amazon is and decided to take that risk for the sake of Bezos’s wallet.
So it’s really up to you. The advantage of Pixel is just that it’s straight from Google so it will always have the latest updates and no third-party software except the ones you add yourself. Samsung and Lenovo tablets may have better hardware but run slightly modified versions of Android, which may or may not be a big deal to you. Try them at the store and see. They should all be able to run the apps you mentioned.