The basic overview of each probably gives the best basic description of the main differences between these themes:
Taskerr connects people needing jobs done with others willing to do them. Those sellers offer their services at a set price and customers buy them. You profit on each transaction.
HireBee is a freelance marketplace theme for WordPress. Employers post projects and freelancers start the bidding. You setup the pricing plans and take a cut of each project.
So really it depends if you're looking at listing tasks/jobs for a set price, or if it's open to negotiation/bidding. Thanks.
