The CMOS version has a quicker rise and a fall of the same length, and the TTL has a slower rise but near-instant fall. Also, the CMOS is much more compact and doesn't use any current on idle while the TTL is much bulkier and uses resistors that take up a lot of space in ICs and consumes 7-4mA on idle. Also, I'm wondering what's up with that backwards transistor in the TTL. Maybe it's supposed to be utilized in both directions, the low reverse beta being used in the other direction.
