The main difference between Shark Pro and Shark Extreme is hashrate and profitability.
Shark Extreme will give you more profit.
Shark PRO comes with 6 GPUs vs. 8 GPUs in Shark EXTREME.
If you want to get the most profitable rig for home - it would be Shark Extreme: https://sharkmining.com/us/shark-extreme.html/
If you want to get several rigs and set up a mining farm, we recommend purchasing several Shark Pros: https://sharkmining.com/us/shark-pro.html/