They are definitely not all the same, but the low priced bulk ones I get on Amazon are generally better quality than the food saver ones. I also HATE the rolls and get precut bags(aside from gusseted) but that's personal preference.

I'll drop a few links for some I order regularly:

#1 most used https://amzn.to/3NSGPY4

#2 for larger cuts like roasts and hams https://amzn.to/3JBCFBq

#3 the only time I use rolls, because these expand and you can cut them to length for sealing really pig stuff like large briskets or whole small pigs. https://amzn.to/42YTRaU