Agree with the try them all approach.
The powderless are quietest, IMO, but have been reported to have problems.
I have done away with a number of pests, including a 6' rattlesnake a couple of weeks ago with the aguila powderless ones.
Be careful, the aguilas have been reported to not make it out of some rifle barrels although I've never had that happen.
I have had them fail to feed and get badly hung up in a couple of semi-auto actions, however.
None of the 'quiet' rounds are particularly quiet out of a handgun, however.
Best,
Will