Mosriteer makes some really good points, but I have to disagree with a few things, especially the statement:
"The fact also remains that the most exciting and sophisticated Ventures tunes/arrangements happened with Nokie at the helm." The "10th Anniversary Album" and "New Testament" were probably the most sophisticated playing and arranging the band ever did. If you put those two records against anything from the Nokie era after '65 (when the band became painfully formulized), there is NO comparison. The '10th Anniversary" LP in particular is a tour de force for Gerry, showcasing various styles of music that were played with great sophistication and legitamacy. I think Nokie was brilliant if the material suited him, but his playing wasn't as versatile as Gerry's (at least during his first tenure on lead). You have to remember, Gerry was a first call session guitarist; those guys had to be able to play tons of different styles on the spot. They didn't just cover the arrangement, they created them.
Also, Gerry's playing and songwriting were responsible for a MAJOR resurgence in Ventures popularity in Japan in the late 60's-early 70's. Even our heroes started to wane a bit in the Orient near the end of the Nokie era. I don't think this was Nokie's fault, however, having McGee on lead rejuvenated them (John Durrill was also responsible for bringing a lot to the table around this time) and kept them current.
I can't discount who Nokie's played with and who's given him (much deserved) accolades, but comparing each other's discography and live work is a moot point. Nokie's success came with the Ventures gig and he will bank on that forever (not that there is ANYTHING wrong with it...I'd take his career in a heartbeat! ). Gerry had a successful studio career well before his tenure with The Ventures, and he only got busier after he left. He toured with many country, rock, pop and blues artists and he's performed on more records then you could imagine.
I love Nokie and Gerry, as well as Bob Bogle. If Bob had stayed on lead, the band would have probably folded or become a 'session band' ala The Routers, T-Bones, etc. Nokie was incredibly talented and his switch to lead was the right move. His playing kept The Ventures on the charts and relevant for a few years, but the theme/concept album formula got stale and it reflected in the charts. Gerry walked into a pretty uncertain Ventures organization when joined in '68 (girl keyboardist and all

) however with him at the helm, they managed one more top 10 single (Hawaii Five-0), several albums with semi-respectable chat placings and couple of gold records. Most importantly, they got back on track in Japan where the had a bunch of big hits. Whether you like Gerry or not, without him, there probably wouldn't be
any Ventures today..