Breastfeeding vs Formula?

Ni
I know most moms are so hyped up on the breastfeeding thing, but does it honestly help? My mom has 6 kids and only breastfed my youngest brother, and he's the smallest out of all of us (compared to how we were at his age) and also he gets sick more often. My boyfriend was also breastfed and he has very bad allergies where as I was formula fed and I have no allergies at all and a strong immune system. Not sure of EVERY benefit of breastfeeding but I've just been basing it off that and still not sure if I really want to breastfeed 😏 Or at least half breastfeed, half formula if anything