Option 1.
SIN-HKG, SQ J 77W
1:05 PM -5:05 PM
Cost- 27.5k SQ + taxes
Pros: Great seat, SQ J lounge, easily switch to SQ R if my waitlist clears on.
Cons: More expensive, gets in a little later than I would like.
Option 2.
SIN-HKG, CX J A350
12:55 PM- 4:55 PM
Cost- 20k BA + $33
Pros: Great seat, cheaper, (hermolis meal?)
Cons: Lousy lounge, gets in a little late
Option 3.
SIN-HKG, CX J 777-200
9:55 AM- 2:05 PM
Cost- 20k BA + $33
Pros: Cheaper than the SQ flight, gets in 3 hours earlier, (Hermolis meal?)
Cons: Angle flat seats, lousy lounge
What would you book?
Timing aside (as we have no idea how important that is here), I'd go for option 1: (i) I haven't flown SQ J, (ii) 7K is immaterial, and (iii) you have a chance to do SQ R, if you haven't.
If timing is the be all end all, option 1: It's a 3.5 hour flight, and you barely will have time for FAs to make double bed on SQ R (trust me), before your on final descent.