I'm flying in business RT on KL/AF from Canada to South Africa. I want to join the ST FFP that will give me the most reward for those flights. Details:

I live in Canada. Most important to me is to be able to use the points for a flight award, either within NA or a Trans-Atlantic. I don't expect to fly with ST much at all, except for this flight and the reward, and will not get a credit card. So I don't care about getting to elite levels or lounge access. Rather, I want to earn the maximum points for this flight and have the maximum flexibility to use the points for a flight award. If any of the FFP's are markedly different in their point expiry policies, that would also play a role.

Thanks!