GSF Pro:
Agressive. I have fished a local public 5 acre pond where there were numerous BG we couldn't get to bite, but just a few GSF that took whatever bait (live or artificial) we offered.
GSF Con:
This is maybe the biggest anti-GSF sentiment at the forum. If your ultimate goal is (big) bass, GSF are a notably poorer choice forage fish than BG (spawn less, compete more with small LMB).
About how big do you think the flooded creek bed pond will be?