The performance parameters of these two mice are basically the same, except that the viper has two more buttons.
The same 6400dpi, the same 50G maximum acceleration.
Both support Razer Synapse 2.0.
The inside is the same, but the appearance is different.
One weighs 80g, the other 105g, and the gold ring is slightly smaller.
Both of them are good in workmanship, but the wire of the gold ring is somewhat shrunk by comparison.
Razer has always been an rts mouse. Even if Viper does more cf advertisements, Razer can't be the representative of fps.
The serpent is full and the small gold ring is exquisite.
Choose whichever you like.