I'm no expert, but the Ford-O-Matic and Merc-O-Matic came out in '51. It was considered a 3 speed auto.
I believe the Cruis-O-Matic was based on the Ford-O-Matic, but came out in '58 ?
I would have to say a Cruis-O-Matic is probably a better trans than the Ford-O-Matic.
Sal