I myself am transitioning back to running from biking and finding it a bit difficult to adjust. What I am finding is that I prefer the gels while running because I can slip them in my little pocket or pin them to my shorts where the packaging of the shot blocks are bulky. I prefer the shots overall but they don't travel well unless you are using a fanny pack or stash them on the road with your water bottle. I find it hard to pack my water. But I am so happy to be running again.