I disagree with this. When carbing a keg, rocking or shaking or rolling (whatever) is completely unnecissary. If you put it at 12psi, it will carbonate...why rush it? Rushing beer only gives you an inferior final product.
The problem is...even if your beer carbonates in 2 days with the "shake carb" method...you still have green beer. Letting it settle for a few weeks is the best thing you can do. You'll end up with a perfectly carbonated, balanced beer.
I don't think they are the same thing, really.
Speed carbing a beer has no impact on the taste of the beer, in my experience. (I split a 10g batch, and did 5 gal each way) ((Not that that makes me an expert!)). Also, rocking a beer
at serving pressure should have no negative impact, other than disturbing the sediment. It will speed up the carbonating process. Doing it at 30 PSI just does it faster, and you risk over-shooting the carbonation - Which is a royal PITA
However, neither of these will fix a green beer! Only time can do that.
OP - If you're in a hurry, you can use a number of methods to speed up the carbonation process. Go ahead and use on if you think you need to - I did! The beer was green, and it kinda sucked, but I was drinking my own beer!
About 3 weeks later the beer was quite good. Had I "Set and forgot" It would have been great beer from the first glass...
The real key is the pipeline. If you're carbing your next brew before you kick the kegs you're serving, set and forget is no hassle at all.
It's always the answer - Make More Beer!:rockin: