Finally pulled the trigger and bought the Tuff Bag. So far, it looks like a fine purchase. Fits my 7/8 PERFECTLY. (Was a tad iffy ordering it, because one of the measurements on my bass - I think lower bout - was 1/2" bigger than the bag's. But there was plenty of give in the other dimensions that it fits perfectly.) Definitely roomy on my 3/4. I'm not sure If I'll hang on to my cheaper thinner bag for that bass - as long as the zippers hold out.
As I expected, the Tuff Bag is A LOT heavier and bulkier than my other bag. Wonderful for the nice bass, but the smaller bag might still get use for my cheaper smaller bass, especially in situations (like my regular weekly jam) where space is at a premium.
Every thing about the Tiff Bag impresses me as being of the highest quality. More handles than I could have imagined, plenty of pockets, and VERY robust hardware/zippers. Will post back in a few years to tell you how it holds up!
And - as always - Steve at String Emporium is a pleasure to do business with.