I prefer the Club Conex Fuse-Fit system as you don’t need to tip trim the shafts any different from the manufacturer recommendations. This allows you to reuse the shafts for another purpose. I purchased these from Golfworks a few years back, then Club-Conex called them all back. Since then I purchase them from CC direct.
Faz-Fit requires an additional 1.25″ of trimming which kind of jacks up the shaft for anything but a 3-5 wood.
Regardless of the system you opt to use, read through the instructions and make sure you understand what they’re saying. I haven’t had an issue, but others have epoxied the hose adapters on wrong and it’s a mess to clean up and correct.
Wishon Golf makes a connector system also, but you’re having to bore out the driver heads – not for the faint of heart I imagine!