[computerworks]

Good question, monk.
It's very tough to compare the two on the surface (FFR and SPF), even though they both end up as Cobra replicas. But, I'll address your resale value question.

FFR is designed as a donor-based kit, sold in bare form, for about $11K. Many actually spend $14-15k with options. Many are completed with donor parts from a 5.0L EFI Mustang. The FFR frame design is good and the overall finished product is strictly a function of the builder. Nicely finished cars sell in the $25-35K range, with a wide variation based on the quality of the finished product

SPF is a factory-built CAR known as a turn-key-minus, which means a finished, painted vehicle without drive train, built by technicians on an assembly line. (I wouldn't call it a kit). I'm told they sell in their "bare" form for $35k. Most buyers opt for a professional installation of drivetrain with new (not donor) parts, often a 351 plain or stroked, adding $10-15K to the cost of the car. ...Being factory-built, there is far more uniformity in quality. That, plus the much higher acquisition cost yields the higher average resale.