Hi Graham, I would say that the first style here is the best way to generate spin and do it consistently. If you stop the wrist and the forearm then it’s hard to generate spin as you don’t have much acceleration through the contact which you do need to create spin. Also if you bring both eh wrist and the forearm though the contact you will have good acceleration but there isn’t that same whipping effect. So method one is the most effective and also the wrist is a key part to having good serves so the focus on this will help you generate more spin and quality. I hope that makes sense and if you have any questions on this just let me know. Thanks, Dan 🙂
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