Here is a little write up about the XLR connectors and their differences.
The Neutrik uses a zing diecast body, brass pins covered in gold, and polyamide insulation which is essentially nylon. It also has an end piece made of polyurethane and the strain relief is polyacetal.
The Furutech FP701M is very similar in design, but uses higher quality materials. The body is made of copper alloy, the pins are eutectic cast copper alloy covered with gold, and fiberglass insulation.
The Furutech FP601M on the other hand are a very different design and even better materials using the best out there. The housing is a high grade non magnetic copper alloy body, the pins are beryllium copper and phosphor bronze covered with rhodium, and the insulation is PVDF Teflon.
I hope that is helpful.