I really notice that the puddles are cleaner in Scotland. I moved from the west of scotland to the east of england, so there is much less rain where I live now. There are rarely any puddles at all and when it does rain, the puddles are dirty brown, so you wouldn't really want to jump in them. I still like to jump in puddles when I get the chance, even though I am 45.
I think the stopping distance on the motorway is longer, and I think that's because there is less rain to wash the oil off the road and make it nice and grippy. The motorways here are also often made of concrete I think instead of tarmac, and it is much louder to drive on.
In scotland, I noticed that big black cars would drive very aggressively up the fast lane of the M8 and slower drivers would get pushed off into the middle lane, so there was very good lane discipline. In England they don't do that so sometimes lane discipline is bad. There are also often a lot of very big lorries driving one behind the other, and they come right up to the back of cars, which is really scary.
The weather is an awful lot better here in the south. I get epic seasonal affectiveness disorder when I was in Scotland, even in summer, and I'm not great in the south, but definitely better.
It's much easier to get sunburned in scotland because even with the sun is hot the air is cold. In england, when the sun is hot, the air is also hot, so I rarely get caught out.
I walk a lot more in england but that is partly to do with my local community. People are chatty and friendly here. In scotland I rarely walked anywhere so never chatted, and that was very isolating.