In which way is Caldera better than Onyx?
Every way.
It's faster. I can get a file in, setup, and printing in caldera before I can get a file in to Onyx
It's modular. I never have to worry about a crash. I can run the whole shop on it without worry. I used to run 5 machines on Onyx, and crashes expected, taking the while shop down with it.
It's scaleable. You can run your printers via one machine, or run each printer via a separate machine. You can have 1 user or 10 or 100 prepping files. You can be printing, cutting, making profiles, and prepping files all at the same time.
It's use of the Adobe Print Engine makes for a very efficient and correct PDF workflow. I know you can get the Adobe Print Engine in Thrive, butit's been with Caldera since v8. It makes PDF workflows simple. Load the file and print. No worries about transparencies, flattening, etc. Files print like they're made.
I've been on Versaworks, Wasatch, Onyx and Caldera. Once you get going with Caldera, you'll never understand how you could use any of the other products I just mentioned. It's so forward thinking.