I like #24 the best here-- Think the S and F could still be a bit bigger to stand out more--and to maybe see the S and F in a couple other sample colours - like red or bright yellow ( with the rest black)
#5 Would prefer a different color combo - too "John Deere" farming equipment colors/industrial looking. I like the font choice and balance in how the 'p' and f' drop down length balance each other out, however, prefer how the first letter of each word is a different color in #24. Not loving how the 'SF' are crafted in any of them. #5 & #24 comes across as a forked tongue, #7 like an alligator....