There is no general answer to your question and the response depends on many factors including your field of research. One simple strategy for journal selection is to choose a journal from your list of references by comparing their scopes, IF, etc.
My area of research is Social Science and these days lot many people are talking about publication in Scopus listed journals. Does it indicate high acceptability of Scopus listed journals as compared to Emerald?
Your question perhaps should be "Which is more valuable publication- Scopus or ISI?" Or "Which is more valuable publication- Indexed journals but low impact or non-indexed journals with high impact?"
It is a common belief that publishing an article in an indexed journal or in an impact journal is more difficult (in terms of paper requirement, length of review process and acceptance) than that of non-indexed or non-impact journals. Many (not all) young researchers will opt first for fast-processed publications to create a statistics of publication in his resume. The others will struggle to publish in good indexed or high impact journals.
I agree with Prof. Behrouz that there is no general answer to your question. If your intention is to get good publications, I would suggest that you should go to publish your papers in high impact journals listed under SCOPUS database. This is because SCOPUS has a better system including its search engine so that your published papers can be easily searchable by other scholars and this will increase your chances to get cited. That is the ideal one. If this one is not possible to get in a short period of time, then go to low impact journals indexed by SCOPUS or other indexers. If it is not possible, then go to other good journals (refereed journals) managed by universities.
You mean Emerald and Elsevier? Because when you compare Emerald and Scopus its like you compare Apple to Rock. Emerald is publishing, and Scopus is an Indexed type like Thomson Reuters not to mention almost all Emerald journals indexed in Scopus. So maybe if you mean Elsevier then, if you get to choose these two, then you can close your eyes and pick, either option is fine. Though depends on your paper, if you have good one then as long as it's not on fake money oriented journal then it's all good especially in open access type of journal, because People will eventually find something good and it's just matter of time even if not on Thomson Reuters or Scopus