Much lower impact on joints. Every person I grew up with that was a serious runner will have knee and/or hip replacements by the time they are 50 (unless they deal with the pain for a few more years).
It depends on a lot of factors. Maybe I'm just fortunate that I have fewer knee/hip pain issues now (worst I've had since 2015 was slight tendonitis and a mild high ankle sprain earlier this year) that I run regularly compared to when I was 100 lbs. heavier? Some of the sports science I've read suggests that running smartly (meaning, not trying to run sub-7 miles within a year of beginning training) actually serves to lubricate the joints, keeping them healthier than sedentary non-activities.
I wish I could swim, but that involves too much pain for me, oddly enough. Possible labrum tear or rotator cuff injury, which is also common in people in their 40s and above. Pick your poison?
Je suis méchant.