I will be reaching LAX at 8 AM.. Then I need opinion on which connecting CX flight to take..

CX897 leaves LAX at 9:40 and arrives HKG at 15:30 (approx)
CX885 leaves LAX at 13:15 and arrives HKG at 19:00 (approx)

And then, I have to take another flight at 22:00 from HKG..

I am planning to travel first class and this will be my first time.. Will there be any diff between CX897 and CX885 (seat, in-flight features, newer flight, etc)...?

Also, is it worth to take the 9:40 flight so I could spend more time at the HKG CX lounge instead of the LAX CX lounge by taking 13:15 flight? But the 13:15 flight will give myself more transit time at LAX.. But is HKG lounge better than LAX to make it worth the risk?

Thanks for your replies !!