I would think the sonographer is more likely to have the better equipment and be more accurate, as well as your pg being further along.

FWIW we were told girl both times. In fact, for this little belly bub, we were given an indication at our 12 week scan that it looked to be developing like a girl, as they were doing an early determination of gender study. Looks pretty much like they were right - but we'll confirm 100% in about five weeks! I think the technology has improved out of sight in recent years.