In terms of features: more stencils (iphone elements, other little elements that balsamiq has), I find it easier to edit button text in balsamiq vs going to the

In terms of features: more stencils (iphone elements, other little elements that balsamiq has), I find it easier to edit button text in balsamiq vs going to the properties area, ability to make a button clickable and go to another sketch, ability to add different icons, import images, and ability to share sketches to mac users/online (this is important personally... I use a PC my co-founder uses a mac... we couldn't use your app to work on wireframes together)