Lots of people like the built in studs (call them V2 for purposes of this thread) and have never had an issue however I chose the extended studs for the following reasons...
Less mounting points hence less chance for error... with bolt on spacers you have two sets of surfaces needing to be bolted down
Increasing number of studs from 6 to 12 per wheel... again more areas to potentially fail
Inner lugs hidden and harder to check torque... potential to come loose without you seeing
Not the end of the world to get the bolt ons but I'd rather spend more time at install knowing I am secure... it didn't take long at all to replace all the studs and the price difference was negligible in either direction.
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