Kinda difficult to answer - depends on your interests and whether you are in academia or private practice. 70% of NS in private practice is spine, so if you are not into that and prefer to do a higher case load of strictly brain, then academic NS is pretty cool... Interventional cards is minimum 7 years, and a lot of places, it is 8... depending on fellowship length. It's very cool, but look into the lifestyle. These guys have to wear lead aprons for hours on end and a lot of them have orthopedic issues and herniated discs, data can be found on PubMed, many studies have been done. They also have much higher rates of brain cancer on one side than the general population due to radiation exposure, and are at higher risk for developing cataracts. Another residency option that is newer, but hard to match into (I assume you are not worried about that as NS is also extremely competitive) is interventional radiology. It's basically interventional cardiology for the rest of the body and in private practice, you get to do a mix of DR and IR, so your time in the fluoroscopy suite and wearing lead can be managed a little better... it is a new residency, so positions are limited, but if you are creative and like imaging, check it out