ETOPS refers to extended Twin operations.
A345 is not affected by ETOPS cos its 4 engine.
B777 is due to 2 engines. Basically, to operate a twin engine commercial airliner, the nearest suitable landing airport have to be less than 180mins away. This is a backup in case one engine failed.
A345 is not affected cos in event one engine failed, there are 3 more to go.
A345 control is via stick (aka fighter jets) and B777 via yoke (like a steering wheel)
B777 is designed by CAD (computer aided design)
B777 seems to be more efficient