Comparisons from the back of the jet
A few facts -- because I have the hard numbers and have negotiated with NJA, Flex and CS.
Generally, for fractional owners (there are exceptions), CS is more expensive by a small amount on comparable jets(Sovereign and XLS). For example a 2008 CS Sovereign 1/8th is $2,100,000 (after some hard negotiating) and a NJ Sovereign 1/8 is $2,037,500 (no negotiating allowed)
For cards, CS and Flex can be less expensive since they have a greater array of product to suit the customer. They both offer cards with various days of service -- like 365 day, 355 day, 325 day and 300 day. If you buy a 325 day card, there are 40 days of the year when you can not fly unless you pay a huge premium. But there are substantial savings if you do not want/need to fly on those days. Marquis only offers a 365 day card, period.
Since I have flown on all 3 I will say the following:
CS puts more seats in the same plane; NJ has more cabinets, etc.
NJ catering and onboard snacks are much better than Flex and CS.
Flex trusts the passengers with an oven for heating food. This increases our choices. Flex also gives us real plates and metal (instead of plastic) eating utensils.
With NJ you win the big upgrade lottery about once per year when you get upgraded from an Excel to a G4, G5 or Falcon.
Fly safe.