The Canyon has one of the best dollar-to-feature ratios in the delay-pedal world (for the time being). These videos pit it against its closest competitor. The big difference, besides price, is that the TC has the Toneprint mode, and runs in stereo, permitting ping-pong (something which can be interesting, but not many players use). Being largely unfamiliar with the Toneprint applet, I don't know how much on the Flashback can be editted. For instance, I don't know if the Flashback can be made to emulate what the Canyon does in Oct or Shim mode. The Canyon provides a lot more options via the secondary controls. Whether the one yields more useful possibilities than the other, I can't say. However, the Canyon lets you do all that without needing to have a secondary control device (tablet, smartphone, computer), which can be handy for some players.
The strum-tempo feature on the Flashback is handy. I have the same feature on my Lexicon MPX-100. Spealing with Steve Bragg at Empress, implementing strum-tempo is quite involved, and seems to demand more computing power than simple tap-tempo. Some folks have better tempo control in their picking hand than in their tapping foot, but some are fine either way. Depends on what works better for you.