An iPad with Wi-Fi + Cellular connectivity will allow you to access the internet anywhere cellphone reception is found, whereas an iPad without cellular connectivity must rely on Wi-Fi or a HotSpot to access the internet. How you use an iPad will determine which one you should purchase.
All MacBooks sold by Apple contain genuine Apple parts, with a flawless design free of defects, and offer a 1 year limited warranty. Amazon Renewed Products differ, however, as they may contain used components in like-new condition. They claim to have no visible cosmetic imperfections, and offer a 90 day limited warranty.
$129 may sound like a lot of money to spend on a pencil, until you use the 2nd generation Apple Pencil. After using it for a day or two, I'm confident you'll find it to be worth every penny. If, for any reason, you are not satisfied, Apple will give you a full refund within 14 days of your purchase.
All MacBooks do not use the same charger. Apple has introduced 10 different chargers since the first MacBook came out in 2006. Since then, 13 MacBooks, 18 MacBook Air laptops, and 48 MacBook Pro laptops have released.