I haven’t stayed at the Poly yet but BLT is my favorite monorail resort. Nothing beats walking to MK.Honestly, I think my refurbished room at Pop Century was just as nice as that room. And then if you want to compare it to a room at The Poly? It's absolutely no contest... the Poly wins every time.
I will never understand why Disney considers The Grand their flagship resort and not The Poly. The Poly has better theme, better atmosphere, better rooms, and same great location (even better since it's a closer walk to the monorail for EPCOT).