The two huge factors here are,
Skill and Experience
I have a ton of both - so how long it would take me to do the same job as someone that's brand new to this type of work could be HOURS, maybe days.
I can knock out most passenger size cars - doing a HEAVY correction step with the Supa BEAST in 2-3 hours using a quality one-step product.
If I were to use the CBEAST - I might had to add 2 more hours. The reason why is because if you're working on paint in bad condition trying to take it to GOOD or even GREAT condition - you're going to PUSH HARD with these types of tools.
The corded BEAST will simply take it. The cordless BEAST will chew through batteries and even when running with a fully charged battery it's simply not going to have the BRUTE POWER offered by a corded tool.
Corded tools, ANY BRAND - will not take the place of the BRUTE POWER you get with the Supa BEAST.
That's just a fact.
That looks like clearcoat failure to me.
It's white and clearcoat is supposed to be clear. When clearcoat paint is neglected and abused for long periods of time it suffers clearcoat failure and the beginning stage of clearcoat failure is the clear paint tuns white.
Next it flakes off.
See my articles here,
Beginning Clearcoat Failure
The Clearcoat Failure Photo Archive
Also - If I were to use the CBEAST to tackle paint that looks like the paint in the picture - I would be using a microfiber pad with the Pinnacle Advanced Compound. The chase the results with a foam pad because FIBERS are ABRASIVES.
Fibers are a form of abrasive - Foam Pads vs Microfiber Pads by Mike Phillips
If it were me?
I would use the Supa BEAST for the car in the picture and the other car. It's just a matter of power, which means SPEED.