"BP or Nexon? Which is worse?"

Well BP suposedly just fixed their error.

"While not a permanent fix, the cap placed over the broken pipe, then covered with another blow out preventer has stopped the flow of oil completely."

May 12th: "WASHINGTON — In the days after an oil well spun out of control in the Gulf of Mexico, BP engineers tried to activate a huge piece of underwater safety equipment but failed because the device had been so altered that diagrams BP got from the equipment's owner didn't match the supposedly failsafe device's configuration, congressional investigators said Wednesday." ~ with regards to the blow out preventer.

It seems like BP found a solution: pile a lot of crappy mistakes together (i.e. operation clog the whole with a lot of half-assed mistakes and hope that nothing comes out).