I'm not that big of a Sonic burger fan. They are way better than the big three but I prefer 5-guys or In and Out to Sonic. It's the shredded lettuce thing. Shred lettuce and put it on a warm burger and you get wilted limp lettuce, not that crispy crunchy bite. THey do have killer rings though.
Jeez do i wish NYC had an In and Out!!! 





