I've used EasyBid for years and find it very useful. l One interesting feature is the ability to download the bid results after they are published and evaluate what trips were available at your seniority. It can help you analyze your PBS preferences to get better at bidding. The companion program EasySwap is also useful for putting in multiple PCS Swap with the Pot requests.

I've never used Bid Central and only used the PBS desktop app a few times, so my review comes from a skewed perspective.