I find this to be very true. And this is what BLOWS.
Femurs consolidate faster, and all doctors (Dr. G, Dr. R and Dr. P have all said this to me) prefer femurs for this reason. Less chance of complications and faster to recover.
But from someone who did 7cm in femurs...your walking will be UUUGGGLY for a while, even after consolidation. And you won't be sleeping while you're lengthening. Femur LL involves your hips (ouch), hip flexors, glutes, quads...it f*cks with everything.
The ONE thing I'm nervous about doing 3cm on tibias is the longer recovery time. I was told by Paley and Rozbruch I'd be able to get around on crutches a bit because I have a strong upper body...but still nervous about this. BUT...I'm also happy that it will be overall less painful, easier to sleep while lengthening, and once you finally do consolidate...your walking isn't nearly as ugly as the case of femurs.