The sports copy desk is probably higher regarded, although news is making big strides and deals with a lot of stuff. Often a bit testy, but probably normal. Depends on the individuals. In news and features, it's pretty much the same people slotting all the time. Some rims help with slotting, though.
Designers are separate.
In sports, designers and rimmers rarely mix duties. Not many people leave, but when they do it's about 50-50 for other papers or other desks. Working quickly on deadline. Overall, probably 25-70 but not many under 35. Lots of veterans but more younger people lately.