Question about vac bagging equipment

What is the difference between using a vac pump like the ROBINAIR 15600 vs a shop air compressor along with one of vacum bagging kits that come with something called a Venturi vacuum generator (the specs say - The venturi generator develops over 20 inches Hg (mercury) of vacuum (10 psi) at 1 SCFM and is designed to run off of conventional shop air compressors delivering at least 60 psi at 2 SCFM.). Are they both in effect the same thing? or would one produce better results than the other?

that would probally work for normal bagging but doesn’t have enough for infusion