I cannot speak to the intellegence difference, if any, between F! F2 Or F4 F5, But I know my little F5 SBT Kilifi is one smart little sweetie. And energetic, a hell of a jumper, lover and a heartbreaker. As I get to know Azidi better I am finding F3C 's are pretty smart too. Azidi is EXTREMELY fast moving. She can move faster than any cat I have ever seen. And they BOTH are so pretty spotted babies. And each unique in her own way. The only thing that may be a bit of a drawback, ( although I do not think so ) is the much over rated size difference. Mine are smaller. Kilifi at 14 months. is 8 lbs 11 oz. Azidi at 3 yrs is an estimated 7.5 lbs. (haven't got her on the scale yet) I would say Azidi is petite. But ADORABLE. But even though they are not Big hunks of bruning love, they are still loving Savannahs and as such are those SPECIAL Kitties.
That"s my story and I'm stickin' to it.