I bought Tier 1 this after scanning through most similar options and these are my first thoughts.
1. Very easy to design and set up signatures on this platform (I am a total newbie but I imagine that even children can use this without too much effort).
2. For every signature, you have multiple built in templates or you can choose to design one from scratch.
3. You can customize pretty much every aspect of a signature and link each part to different landing/bio pages.
4. Social media icons can be customized to your brand colors and linked to the respective pages.
5. I had a question about email banners and the response was prompt (though I later found the answer in the FAQs).
6. Of course, designing skills on canva/similar platforms can enhance the appearance of your signature.
7. I have not tried tracking or anything of that sort yet, won't be using this with gmail but i can use the html code for my purposes.

So far, so good! This platform gets my vote for its simpicity/ease of use and customization options.