B738.
I go with the visual guys until 9 degrees nose up. Then the outside horizon has disappeared, and it is at this angle when the a/c stops rotating and you need a little more elevator input to keep the same rate of rotation. Better to do that inside. Pause at 15 degrees, get the gear up. The F.D will then have decided what is going on and give you correct commands.
I see many pilots rotate at the wrong rate and go immediately to the F.D pitch bar. This can cause much porpoising until lo- & behold it settles down at 15 degrees, if on a weight matched assumed temp N1%. If using a higher power setting than RTOW tables the final attitude will be nearer 17 degrees.
If you rotate too slow, the speed will be high and the F.D could command a higher attitude for a few seonds. I've seen it above 20 degrees. Never go there, but I've seen them that do, if they rotate into the F.D. The speed bleed off is rapid.