I have found advantages and disadvantages to using a liquid deodorant. I found that when using a liquid deodorant, it didn't leave marks on my shirt like a solid did. This was one of the things I really liked about it.
What I didn't care for is I felt like I had to apply it more than once a day to control the odor. By the middle of the afternoon I just didn't feel as fresh as I did when I used a solid deodorant.