I am using a backpack and a couple of shoulder bags. Both have pros and cons.
Backpacks: easier on your back since the weight is evenly distributed to both shoulders. Some come with a tripod holder so your hands are free. However, wouldn't be so practical for street photography as access to camera is very slow and cumbersome.
Shoulder bags: Can be unfriendly to shoulders and backs. I usually switch sides from time to time. Doesn't come with tripod holder. However, accessing to camera is very fast.
I usually use backpacks on hiking and travel trips together with a top loader. Use shoulder bags for other occasions.
Backpacks: easier on your back since the weight is evenly distributed to both shoulders. Some come with a tripod holder so your hands are free. However, wouldn't be so practical for street photography as access to camera is very slow and cumbersome.
Shoulder bags: Can be unfriendly to shoulders and backs. I usually switch sides from time to time. Doesn't come with tripod holder. However, accessing to camera is very fast.
I usually use backpacks on hiking and travel trips together with a top loader. Use shoulder bags for other occasions.