When Goku reverted from SSJG back to his base level in BoG, Beerus commented that his power didn't decrease by much, because he'd absorbed that realm of power into his being. So while SSJG is more powerful than base, the difference isn't vast.
As for BSSJG: it is essentially just a more perfected version of SSJG, with better ki control and no time limit(liken it to n00b SSJ compared to FPSSJ.)
Using the scale Toriyama provided, this is how I'd rank the pertinent characters from BoG/RoF:
Whis=15
Beerus=10
Golden Freeza(100%)=9.0
BSSJG Goku/Vegeta=8.5
SSJG Goku=6.0
Base Goku/Vegeta=5.0
4th form Freeza(RoF)=4.0
That being said: BSSJG Goku could likely take both scenarios, imo--though a solid argument could be made for the team in the second scenario.