If your mobile line is not with StarHub, then you better get the individual 1Gbps Fibre Broadband unless you have plans to change to your mobile to StarHub. For me, I have mobile, TV and Fibre services with them but I still choose to take up all individual plans instead of HomeHub. (That will still make me a hub club memebr with more discount)
Taking up individual plans will be cheaper monthly and your individual services can still get further discount (due to hub club benefits). Fibre will have 5% off, TV 10% off and mobile from 10-30% off depending on the number of lines you subscribed to. If you get the HomeHub, you won't have additional discount like what I have breakdown unless you need that measly 1GB mobile broadband and TV voucher to offset TV pack monthly (still I won't recommend).
One thing to note, for both solution, you still need to add in $6.42 monthly for the TV set-too box rental.