I've had several of each.
Bang for buck, most certainly either the G3 of FNFAL. Really, any of the three are exceptional main battle rifles in their own rights, I'm biased to the FN since parts are/were plentiful before it was added to the prohibited list here in Canada (yes, even with 5 shot mags, it's more dangerous than a Browning 5 shot semi auto .308 for some reason).
One fun thing with the FN....either a matchstick or removing the selector results in Full auto funess, particularly with the Metric models, haha. Be sure to try that at least once far, far away from any ATF offices.
BTW, an as new British L1A1 FN goes for about 200$ USD here in Canada, unfortunately, they can't be exported into the USA, or purchased by 99.9% of the people out here as they are in the grandfathered prohibited class.