Gender prediction theories, what do you think?

Rocio
Hi! I'm 16 weeks 2days pregnant with twins! 😃😍 two doctors have said that Baby B is a boy but Baby A is causing a little bit of controversy! The first picture is of ultrasound done on Thursday. The second picture was taken at week 9.  What do you guys think based on the different theories out there (skull, nub, etc)