Yes. Protein you chew is just as good. That would be because those powders are just from plants/animals … made into convenient form to make other stuff with.
Whey and casein come from milk, beef protein comes from beef, rice/pea/soy come from what you'd expect… as does egg protein.
In many ways, it's like asking "why get the powdered milk… isn't MILK just as good?" Um, yeah. Same thing.
Well, except you can more easily control your protein content and do it without any fat or carbs, if you so desire. Or make them taste like chocolate.
I find personally Power Bars to be too high cal and too low protein for my taste. Tend to go more with Balance myself… suits my interests better. (and taste buds.)