A pear contains higher concentrations of good fructose along with higher fiber, thereby it would explain their laxative properties and have been encouraged by others to include in healthier diets. Whereas Pepsi and a lot of other sodas use cane and beet sugars (some have switched over to high fructose corn syrup), and while commercially cheaper in some areas due to production, are oftentimes put into a lot of processed foods to sweeten them. While they've done 'throwbacks' to using real sugar instead of the refined stuff, drinking soda still has a ton more sugar compared to eating raw fruits and veggies.
Most good sugars, such as those found in fruits and veggies naturally, are unrefined and are easier for the body to process, and there is no limit as to how much you're actually allowed to consume on that end.
Lots of refined sugars in larger amounts are never good to have, despite the sheer amount of products they're in in most American-made foods. I'm not certain about other countries, but it's quite present here. Pepsi and Coca-Cola are notorious for having refined sugars, especially HFCS, in its products and drinks, and is what gives it that sweet taste. Lots of doctors will tell you to cut back on sugary foods if you're in need of weight loss/diabetes management.
I should know as I oftentimes consume sodas, particularly Mountain Dew, as that's loaded with sugar and have been trying desperately to cut back on the sodas. I also work with refined sugars on a daily basis, and it's heavily present in every decadent product I make, whether it be in the icings, syrups, cakes, breads, or the vendor products we get in.
In short, the video saying eating a pear is comparable to drinking a can of Pepsi 99% have not done their research at all. Just eat your fruits and veggies as any normal person would, and you'll be just fine.