I have not seen the E550 yet, but last year the st30 was superior to the D550, so going off that and the amazing reviews the ST50 has, i would confidently recommend the ST50 over the E550.
As for 3D glasses, panasonic i think just realeased their new bluetooth glasses, but i havent heard anything on them yet. I will say samsungs 2012 glasses are really comfortable.
As for 3D quality, they will likely be the same, but again since no one has commented on owning a pair of 2012 panasonic glasses, there havent been comments of the quality either. The st30 has good 3D in my opinion. Perhaps go into the 3D setting on ur bros tv and adjust the 3D depth to see if that helps ur issue.