How does the C ffi in Chez (or guile if anyone is familiar) compare with Chicken? I’ve heard good things about all three but have only used guile a bit, but nev

How does the C ffi in Chez (or guile if anyone is familiar) compare with Chicken? I’ve heard good things about all three but have only used guile a bit, but never the C ffi. I’ve heard Chicken proponents speak highly of the ffi but have not seen any comparisons between the three implementations.