This could change, but based on where we look to be heading, my money is on China.
Iran
Regionally:
Europe loses as China gains, because they refuse to help the US. (good)
Other Arab states lose, no one comes out ahead if China (or its proxy) becomes your next door neighbor.
Iran
- As the US destroys more infrastructure, Iranian need exponentially increases and they will have few other places to turn.
- Iran also will need modernized weapon systems after the shellacking they took in this war.
- From Iran, an overland pipeline is possible through Pakistan and then into China.
- Iran would also become the key platform connecting Chinese military and economic power through the middle east and into Europe.
- Of course, China also gains a huge seat at the table in the middle east.
Regionally:
Europe loses as China gains, because they refuse to help the US. (good)
Other Arab states lose, no one comes out ahead if China (or its proxy) becomes your next door neighbor.