If all that you need is a simple read function for pdf documents, Sejda does fine. If you want to be able to highlight items or convert the pdf document into a Word document for editing and revisions, this tool does not provide strong functionality.
Email to PDF for Outlook gets an 8 as a rating from me because it is pretty good at almost everything it does and helps me and my business be more organized and efficient when sending and receiving documents and categorizing important information. It loses 2 marks from me for not being able to automatically save emails or remove sender and receiver information.
I have not used any other products like Email to PDF for Outlook so I am not able to say how Email to PDF for Outlook stacks up against competitors in terms of easy of use, cost, efficiency, helpfulness, etc. When I have tried other products, I would be better able to make that assessment.
Adobe has more functionality, but there have been some concerns about ongoing support. Sejda was seen as a viable alternative for the majority of our users, who only need to read pdf documents, and not do any revisions or markups.