Ask 3 pilots-and you will get 4 different opinions...
It all depends upon where you want to fly the machines...
I have seen Belly tanks with a retractable filling hose, i have seen Buckets with Powerfills.....but:
Every system/helicopter is only as good as the pilot operating it..
I do not understand some companies/customers insisting on Multi-Pilot operations in Multi-Engine-helicopters due to some dodgy "safety regulations"....
A single pilot/single engine helicopter (when well maintained), flown by a well trained and experienced pilot is as safe as a ME-helicopter flown by 2 experienced pilots......
One more thing comparing the bambi bucket to the belly tank:
The bambi bucket can easily be repaired-even in the field..