Differences between TimelockControl and TimelockCompound

So I have this question about the difference between TimeLock contracts (probably dumb questions) : GovernorTimelockControl.sol and GovernorTimelockCompound.sol

Which is more safe? I saw a warning message in the GovernorTimelockControl.sol about have additional proposers besides the governor and didn't get it.

Why the GovernorTimelockCompound.sol needs to be the admin, and the GovernorTimelockControl.sol needs the proposer (and ideally the executor) to work?