Not seeing any obviously good value plans here - your numbers may vary based on your corp discount, but if my calculations are wrong - please correct me.
I'm interested in the Iphone11 128Gb:
Starhub $50 2-year Plan (at $40) - (40*24) + 651 = 1,611 (15Gb, 100Min, 0SMS)
M1 - mySIMe40 (at $36) - 36*24 + 780 = 1,644 (15Gb, 100min, 100sms)
Singtel - XO48 - (48*24) + 678 = 1,830 (possibly before a device discount? TBC) (10Gb, 100min, 100sms)
Just for comparison purposes:
Singtel GOMO - 20*24 + 1,219 = 1,699 (20Gb, 200min, 200sms, no contract!)
No contract looks better to me.