Aweber is a fantastic email marketing platform for small and medium-sized businesses that has stood the test of time. We have always seen solid delivery rates with Aweber. Their interface is straighforward and they offer excellent support. Their only shortcoming is the lack of flexibility for segmenting leads. This isn't a big deal during the early stages of business growth, but it can become more of an issue down the line. That said, we highly recommend Aweber. We've relied on their platform for countless email marketing campaigns over the years and they've never let us down.

ConvertKit is quickly becoming one of the most popular and respected email marketing platforms out there. In our testing, we found email delivery with ConvertKit to be on par with Aweber. Where the tool really shines is in the area of lead organization and management. Instead of building individual lists, all of your leads will go into one big "list" that you can then segment into subsections based on tags. This gives you a level of freedom and flexibility with your email campaigns that you won't find in other platforms. ConvertKit is still somewhat of a new kid on the block, but they're doing a lot of things right, and we like what we've seen so far.