I would like to share my experience with both mice. I bought them both in the same week, the Razer DA Black Edition and the SS Sensei are both very great mice HOWEVER it really depends on how it feels in your hand. With the Razer DA I realised that it wasn't comfortable. Why? Because DeathAdders are more suited for palm grips due to it being a little higher and possibly wider at the back of the mouse. The Sensei was more suited for me due to the simple fact that it felt like the old microsoft mouse that I'm sure we've all used in the past - except a lot more SOLID(more solid than the DA) cleaner and responsive. I decided to keep the Sensei and return the DA and haven't regret my decision There is a reason that the Sensei costs $50+ more.
I suggest you try both mice and see how they fit in your palm rather than just buy the one that people will tell you to buy, after all it is what you're more comfortable with.
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Formerly known as suman
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