Basically, there's no diff. Flt Ops stands for Flight Operations. I think they're just using this title to sort out those who are RESIDING in Singapore (as stated on the first few lines) and those who are applying from elsewhere (i.e. Penang, KL)
BTW, you can't really choose to go to SIA nowadays although you will be asked for your preference. It can be SIA, SIA Cargo or Silkair and you're basically at their mercy.
I see no reason why I am qualified for fighter planes and not good enuff for commercial planes
Whoa there flyboy, you're comparing apples with oranges. Fighter planes and fighter pilots are expendable as long as the MISSION is accomplished. Commercial jets and 300 plus fare paying passengers are not. As a commercial pilot, you don't just fly the plane and complete the mission.