They are genuinely more reliable. Having more stalls does help for when there’s issues, but they have 99.96% uptime across the entire network. I’ve had to move stalls once in my almost 3 years of ownership.
They also have their own service people that travel to chargers to fix them, where Electrify America hires local electrical contractors that may not be experts on DC Fast Charging equipment.
Edit: ran some numbers and I’ve charged 109 times on Superchargers. One failed session. I live in the rural Midwest/South so it’s not like I’m in EV heaven either.
What car do you drive where charging stops are that long? My average Supercharging session in my base Model 3 is 9 minutes. That’s barely enough time to go pee and walk my dog.
I strongly prefer road-tripping my EV because the natural breaks mean I arrive more refreshed and less sore.