So Knott's has started to prepare land (where the old Walter K. Steamboat was) to build a new Crazy Mouse Spinning Coaster had me thinking.
Mailboomer and Supreme Scream... Both are rides built by S&S, but Knott's is the larger of the two.
Orange Stinger and Wave Swinger... Both rides are about the same, I prefer the one out in the open instead of enclosed.
Bumper Cars... Both have the same height limits, but the Knott's version is faster.
Grizzly River Run and Bigfoot Rapids.... Same basic ride, DCA's version is longer.
Ghostrider and California Screamin'... Ghostrider is a true Woodie, and ranks higher on Best Coaster lists than Screamin'
King Triton Carousel and Knott's Merry Go Round... Knott's is a true classic Merry Go Round as compared to the fiberglass DCA version.
And now we will have....
Mulholland Madness and Crazy Mouse... Both rides use the same wild mouse type of track, but with Knott's, you will have the extra "spinning" action (similar to Primeval Whirl at DAK).
So IMHO you 7 very similar rides, in which Knott's has the better version 5 out of the 7, DCA has 1 (GRR) and one is tied (Wave Swinger).