I'd say MCPHS Hands down. Although there is a thread somewhere on this board with a really long discussion about how difficult MCPHS-Worcester is, its reputation is really the school's strong point. I was also considering Worcester at one point against LECOM-Erie, and all the pharmacists that I worked with recommended MCPHS simply because the school has been around for so long and has such a great reputation. Plus Worcester students share the same rotation sites as Boston students <- tons of rotation opportunities.
USN does not have nearly the reputation nor the facilities and rotations as MCPHS. I don't know when USN Pharm was founded, but LECOM Erie is a relatively newer school while MCPHS has been around for, but don't quote me on this, 100+ years.
By the way, did you also interview at LECOM Erie?