I babysit a 3 year old boy who is still wearing diapers and he wears Luvs diapers.
I have never experienced any leaks with his Luvs diapers and he's a pretty heavy wetter when he pees.
The Luvs diapers tend to hold up well for him for 4 hours before he needs a diaper change.
However with my own son I did experience leaks with the Luvs diapers.
So it's probably just the kid who is wearing the diaper and how bad they wet or their body shape.
My own son who is 2 wears Huggies Snug and Dry diapers and they work just fine for him.
But Luvs diapers would leak on him and he got a chemical burn from the Luvs diapers but the 3 year old boy I babysit who wears Luvs does not get the chemical burn from the Luvs.
So i think it's just that the kid who gets the chemical burn from Luvs is allergic to the chemical that gives the Luvs diapers a scented smell.
Some kids can have allergic skin reactions to some chemical but another kid may not.
If your kid is leaking out of the Luvs diapers then they may just be peeing too much at once or the diaper does not fit properly.
You may need to change your kids diaper more often or switch brands.