Nitron has been around for decades. They are UK based, used on some OEM cars like Lotus (Exige?), do a lot of motorcycle dampers, and apparently have an office in Southern California.
They are a motorsports damper like Ohlins, Penske/JRI, JRZ/Moton/MCS/AST, etc... When it comes to these dampers, the fitment and performance will almost always comes down to who built the shock, determined the physical dimensions and valving. This is far more important than which company's valve design is theoretically better.
In most cases, there will be a separate shop or company or person that deals with a given manufacturer and will either order individual parts and assemble the dampers and then sell them to you as a customer, or will specify the valving and assembly lengths to the manufacturer, who will then build the shocks for them that they will then sell you. Most of these motorsport damper companies do not do their own development to offer a product for a given car.
So you need to ask "who is doing the development?" It might be better to select a product that has been tested and used with good results by a previous owner. Going down the path of trying something new or being the ginue pig
Eric Messley was the go-to NSX Penske guy. JJ Furillo does great work with JRI dampers (the company that was created after the head Penske damper designer left Penske) and makes JRI dampers for the NSX. I'm not sure who the current go-to shop is for JRZ/Moton/MCS for NSXs. I'm not sure what Nitron's background is with the NSX platform or who helped with that development.
KW does their own development and I've worked with them on the V3 way back in the day and have given them feedback on their new 4-way adjustable "V5". The V5 is part of the "newer era" motorsports damper design, which has gone from a mono-tube damper to a twin-tube (Just like the Ohlins TTX and Multimatic DSSV dampers). I'm not sure if Nitron uses a solid piston and twin tube design, or the older mono-tube motorsport valve design.
For the price, the V5 offers the technology and performance that is hard to beat, and the ride quality is worlds better than the V3. I'm also eager to learn more about the Nitron's because they are a solid company and I don't know much about their NSX involvement.
I'm also unsure which parts of the damper that Nitron uses titanium for...