If I read your post correctly, you have those three places as options for arrival/departure. The main Greyhound terminal is next door to the Plaza. You could catch a cab at the Plaza, Lady Luck or Strat, AZ Charlie's Decatur would be too far to walk to from any of those locations. I'd guess that either the Plaza or Lady Luck would be a little closer to AZ Charlie's Decatur than the Strat would be.

I'm flying in Thursday night and will be staying at AZ Charlie's the entire weekend, very good room rates!