After 18 months of having a boy and a girl here are the differences I've noticed up to this point.
1. If my daughter was running and fell I was on a full sprint to make sure she was ok. If my son eats it, I might kind of look up from whatever I'm doing to make sure there is no blood. I generally just say "Get up, your fine." And he is fine, even when there is blood. The kid never cries. It's great.
2. My son is 100% content to be on his own, he is on his own destroying everything in his path but he's not hanging on to my leg constantly like my daughter was.
3. My daughter was fully potty trained by the time she was 2. Hated having a gross diaper from a very early age. I doubt my son will ever be potty trained. He's totally fine with poo.
4. My daughter loved me when she was a baby, still does, and would sit on my lap content for hours. My son will not sit still for 1 second and would rather try and bite me when I'm not looking than sit on my lap and chill out.
5. I cannot wait for my son to get older so he can do guy stuff with me i.e. watch sports, go golfing, drink beer etc .... It kills me that my little girl is growing up. I never want her to get a day older.
Just thing's I've noticed.