The difference is Schlages are worth re-keying, and that's almost always the only reason to remove one. Defiant is Kwikset, which is crap, and they break.
For $60 you can get a Schlage re-keying kit. And for a few hundred dollars you can get a key duplicator. With both of those, e.g., you can make the gate key use just two of the pins that are the same for the lock on your house. Then you can give the gardener a key to the gate that won't open the house, but your single key does both the gate and the house.
With that in mind even if you're not going to do it (which is a pita), there's no reason to get the mid-grade offering. I have blanks to make Kwikset and Schlage keys. I don't need a third type floating around from a manufacturer that I've never heard of; go big or go home.
I do a lot of investment property, and ordnance requires me to change the lock for every new tenant, which is where these tools come into play. But you can buy a $60 lock and have 'done' this once, or buy the kit and be able to do it again. Being cheap at the onset of a project doesn't usually save you money in the long run.
I reinstall old Schlages with confidence and no call backs. Old Kwiksets go straight into the garbage. The only time I can recall having to arbitrarily discard a Schlage is because the door was kicked in (the cylinder probably still worked fine). But since locks only keep honest people out, I do my best to keep them so.