There are some good comments here about alternators.
First determine what amperage you might need, full IFR, day vfr, LED lighting, etc have an effect, You can see the range of usage from 40-60amps.
Second, voltage limiting circuit, commonly called a "crow bar". So called, as it is like throwing a crow bar across the terminals and it will deliberately blow the field supply 5 amp fuse. It will prevent damage to glass panel and battery. It typically set at 16.7 volts. I don't know if it has a time delay.
Third - internal vs external regulator, Lots of different opinions based on the experiences of failure and pain getting replaced or locating a replacement part. You will have to wrestle with that. Either internal or external can use the voltage limiting. A separate unit can be purchased from B&C.
Fourth - cooling - that is another variable subject. There is a point where the electronics, diodes etc, will fail. While they all have internal fans, exposure to exhaust or hot air is a factor. The largest factor affecting life in a developed alternator/regulator is probably the temperature. Many cool with a blast tube and many do not, both have been successful for many hours of fun.
Well, there you have a summary of many hours of VAF, and what you will have to decide for yourself.
FWIW - I have the Plane Power, 60A, internal regulated and with crowbar circuit. I will measure temps to see if a blast tube is needed, although PP says it is not required/recommended. I did not select it because I am smart or have experience, VANS sells it with FWF kit, so I got it. For me, a "crowbar" is a must for my glass investment and IFR.