Saracenn, what you have experienced is very typical. One of the most common question in this forum is: "Which FFP is right for me?". And the answer we always give is: It depends.

It firstly depends on what you want from a FFP. For some people, it is all about miles earning. For others it is about status, for other about upgrades.

The second question then is: What is your flying pattern? Which routes, which airline and what type of tickets?

Depending the answer people give us we try to come up with a recommendation. BD is great when you fly lots of premium cabins. Their redemption options are fantastic. UA is great for cheaper tickets and their fees for award tickets are much lower. However the block availability on many *A awards so you can not get seats while people using other FFP can book their awards.

This is also why there is not tool to compare. It is not only very complex, but it is also so depended on your personal preferences and circumstances.