I particularly rely on indexed journals, impact factor is not my priority, but open access it is. Then I try to get to the editors that I have better access and are more available.
I think the two most important factors for me and others in my group are the match with the paper topic and the quality of the work published in the journal already. Rather than limiting oneself to open-access journals, I would suggest uploading an authors' version (on your webserver, on your university's eprint server, or here on RG, for example). That way you can have the best of both worlds.
As for reaching practitioners- I think there are better ways to do this. The wider your audience, the more difficult it is to make use of their existing knowledge and interests when you write. It is exceedingly hard to write texts that appeal to both a scientific and a practical audience. I'd rather publish a paper for researchers and write an extensive blog post explaining the research to practitioners. That way you can focus the text on each group.
I particularly rely on indexed journals, impact factor is not my priority, but open access it is. Then I try to get to the editors that I have better access and are more available.
Submitting a manuscript to an unsuitable journal is one of the most common mistakes made by authors, and both novice and seasoned researchers are capable of making this error. First-time authors or those who are branching out into broader research territories may be unfamiliar with the journals in the field. Meanwhile, experienced authors may be tempted to publish in the same journals as always, despite the fact that new publication opportunities are constantly arising in the form of electronic-only journals and open access publications. Even rigorous, high-impact work can be rejected when the topic of the research does not match the scope of the journal, and making this mistake wastes time, money, and motivation.
Below are some of the most important criteria to keep in mind when choosing a journal that is a good match for your research.
1) What are the aims and scope of the journal?
2) Has the journal published articles that are similar to yours?
3) What are the journal’s restrictions?
4) What is the journal’s Impact Factor?
Consider using Journal Guide as a tool to guide your selection
Note that many journals (including many of those published by Elsevier and Springer) can, for a fee, publish your article open access even without being open access as a whole; of course, you must check separately whether this could be done for any specific journal you are interested in.
Also, many Springer journals let you share your article via ReadCube so that it can be read by anyone (but cannot be downloaded if one has no valid subscription) who has a sufficiently modern browser to handle enhanced PDF; for example, the published version of my recent article Integrable (3+1)-dimensional systems with rational Lax pairs can be read in this way here: http://rdcu.be/Dkwh .
This can be a reasonable substitute for open access (of course, if you are not officially required to publish open access by, say, your university or your grant agency), but again you should check this for each journal separately whether this feature is available for it; see also https://www.springernature.com/gp/researchers/sharedit for details.
To find Springer journals in your specialty you can use inter alia the following tool: journalsuggester.springer.com