Well
with NJE you never know what you gonna get if you have 3000 hours JAR 25experience and captain experience , and netjets needs guys on large cabin aircraft (Falcon, Gulfstream) then you might be picked to go on that fleet and wait an average of 2 years before command.
So with Netjets there is no neccessery a quick upgrade.
It is either small cabin and fast upgrade or large cabin and very slow upgrade but very relax operation and cabin crew which make it nice instead of being facing the same guy for a week.