I use QFF for this purpose; however, be aware that the value of a FF mile is substantially different in the various plans. For most awards, it costs twice as many QFF miles than AAdvantage miles, for example. So earning 50K on AA might be worth more than earning 100K on QF. The actual award costs vary tremendously by type of award (routing, etc.) so this is just an average (2:1); some QF awards are cheaper than the equivalent on AA (about 1% like that, mostly things like one-way that AA doesn't offer, so you have to book round-trip award and throw half of it away), and the worst case that I have found cost 500% more on QF than on AA (and with more restrictive terms, so it was for a worse product!). All 8 of the OW FF plans have such differences, and optimizing earn/burn rates is a complex strategy.