Which preferred is best? Considering add some preferred to hedge commons
That depends on your preferences for liquidity, par value, dividend rate, potential damages in Lamberth's court, etc.
Without considering Lamberth's court, and if you don't care about having illiquid shares, FMCCG and FMCCI are strong buys. If liquidity matters some, FMCCH and FMCCS are better. If liquidity matters a lot, FNMAS is your best bet.
If the damages in Lamberth's court really are reduced for series that have paid out a lot of historical dividends, FMCCS stands out as a big bargain because it has a more recent issue date than many series (2005) and a low dividend rate.