The best thing is probably its ease of use and not to mention the exhaustive options that really allow in depth customization based on your needs.

We absolutely love how much we can style our giveaway with SweepWidget! Our website has a very specific theme and we needed a giveaway to fit perfectly into it. Not only did SweepWidget have all of the entry types and integrations we needed, but the style editor was above and beyond any of the competition.

I'm most impressed by their viral share option, as well as the fact that there are so many entry options to choose from. In addition to that, I believe they are the only giveaway tool that offers so many language options, so if your site is in a language other than English, don't even bother searching for a better alternative - there isn't one