United 787-9 VS 777-300ER

[eeliechick]

Looking for Pros & Cons of both aircrafts in Economy or best pick of aircraft.
Considering the SFO/SYD route but its a 777-300ER, I cant find much information on how old these aircrafts may be or seat comfort/humidity levels would be compared to a 787-900.
I flew the 787-900 last year LAX/SYD and was pleasantly surprised so inclined to stick with that but the SFO/SYD flight has better connections for me this time around.

 

[AIRwin]

Some recent discussion here almost a year later:

United Airlines new Virgin Australia/Velocity Partner

Redacted - I was wrong.

www.australianfrequentflyer.com.au

 

[danielc]

I had a similar option to choose recently. Originally booked PER-SIN-SFO return utilizing SQ and UA for my trip next month. Last week noticed that I could change the return flight to SFO-BNE/SYD then VA across to Perth for a nominal amount.

Looked at both the SFO-SYD (77W) and SFO-BNE (787) and ultimately went with the BNE flight as I thought the terminal transfer would be easier and the long trans-pacific flight a bit shorter.

Aircraft type did not really influence my decision as both the 787 and 77W are similar vintage. I flew the inaugural UA 787 MEL-LAX back in October 2014 when they had just introduced the type to Australia. United was a late-comer to the 77W with this plane coming online starting 2016. The plane operating the SYD/SFO leg today arrived in April 2017. 787 seating will be 3-3-3 versus 3-4-3 for the 77W.