Being a manager is far better than doing bounties, when in terms of work the manager has the easiest job and when it comes in payment the manager has the highest amount that will get.
I'm sorry to tell but it looks like you didn't read the questions of the OP. He is not asking which one is better, being a manager or a bounty hunter. But about managers who is having their own websites to manage their bounties as opposed on managers posting their bounties here in the community. And regarding the OP dilemma, its better to stick on the bounties here as spreadsheet is public and every bounty participant can readily see their stakes and if someone seems is off, participants can easily question the manager.