Welcome to AFF
aussiexj
There is no single FFP that is best for everyone. If you can provide more info that would help.
where and how often do you fly? also is this economy, business or first class, or cheapest you can get?
how do you want to use your points/miles? upgrades? award flights? where? what class?
what non-flying earning might you be able to do? credit card is obvious and a major consideration, but also hotel and car rental
if you fly a lot then airline status will come into the equation - are these benefits highly valued or concentrating on the points/miles aspect?
where are you based?