Yes, I believe you can save the subscriber list onto your computer with both services. While moving subscribers from Mailchimp to Aweber was relatively straightforward, it did take me quite awhile to move all of my autoresponders and port my entire setup to Aweber. So if you can afford it, I would simply start out with Aweber and stay with them instead of having to move later.
Price: Several users feel that the price is too high for many small businesses, especially businesses that don’t need all the bells and whistles AWeber has to offer. This is compounded by the fact that there’s no “dormant” mode; so long as your lists are in AWeber, you’ll need to pay the monthly fee based on your number of subscribers, whether or not you are actually sending emails. Some would like to see a low-price or freemium option for very small businesses.
I totally agree about content. I have been a long advocate of this because if there is nothing on the website, then there is no reason to return. E-mail campaigns are only good to have people return to the website. Having people, come once is a waste and will probably get people to unsubscribe to your e-mails. And once they unsubscribe it is nearly impossible to get them to subscribe again to be on your list.
Do most people open your emails on desktop or mobile? Email messages opened on a mobile device have nearly doubled over the past 5 years, while emails opened on an internet browser have dropped 26% in that same timeframe, according to a study from Return Path. If you find your list trending toward mobile, too, then aim for short email subject lines (35 characters or less). (Not sure how your audience reads your emails? Services like Litmus and Email on Acid can track which devices your subscribers are reading their emails on.)
Now, you can automatically send highly relevant emails encouraging them to buy the product or service they were considering. Customers who received multiple abandoned shopping cart emails are 2.4 times more likely to complete the purchase than those who receive only one followup email, according to Experian. Try sending the first message one day after, a second message 48 hours after, and possibly a third message within three or four days of abandonment.