Private jet
My friend, to get in corporate ops the most important thing You need is connections / know the owner(s). Besides large operators like Netjets and similar, there are no assessments whatsoever or the assessment is a phone call with Your sponsor telling the boss You are a good guy.
Now a lot of pilots have spent their time trying to get better in their profession rather than trying to hook up people that could introduce them to other people who could eventually land them a job in a G650 after many years of harse licking. The day I will see job postings for non rated pilots on those kind of machines with airline-like assessments (tech/sims, etc.) then we will be talking the same language.