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How is Spectrum's PQ compared to DTV?
As a subscriber to both, in my area, the picture quality is about the same when comparing the two services on the same channel on the same TV. Some channels look slightly better on DirecTV, some channels look slightly better on Spectrum. There is no significant difference IMO. The color saturation may be a little bit better on DirecTV, but it's close. I cannot tell the difference between Spectrum and DirecTV, but I can pick out Dish Network in a heartbeat because of how washed out the picture is at times.
Earlier this year Charter pushed out an update for boxes running Spectrum Guide that upconverts content to 1080p, and that has helped, no more jaggedness around text.
For audio, DirecTV is definitely louder, I can't say that it is necessarily better though. Some times the rears are so loud they drown out the front L + R and center channels. Probably could fine tune this in the settings for my A/V receiver, I did the initial set up using cable as the source.