Why would I choose a Participating Forward over a VPFC?
If you believe the company could be worth significantly more than the VPFC Cap at IPO, the hard ceiling in a VPFC becomes very expensive: you forfeit all upside above it. A Participating Forward lets you capture 60% (or whatever your retention percentage is) of unlimited upside, at the cost of a lower initial advance. Use a VPFC when you want the maximum immediate advance; use a Participating Forward when you prioritize upside participation.