With your set-up (maxcitenames=2, uniquelist=minyear) I get
Adams, Hill, Jones, Lamar and Wang, 2015
Adams, Hill, Jones, Lamar, Walker et al., 2015
for the dummy entries (and those entries only!)
@article{adams1,
author = {Adams, J. and L. Hill and J. Jones and K. Lamar and T. Wang},
title = {A Nice Title},
year = {2015},
journaltitle = {Journal of Articles},
volume = {10},
}
@article{adams2,
author = {Adams, J. and L. Hill and J. Jones and K. Lamar and A. Walker and T. Wang},
title = {Another Nice Title},
year = {2015},
journaltitle = {Journal of Articles},
volume = {11},
}
this is clearly unambiguous and does not suggest the two articles were written by the same group of people. It might be a bit long for a citation label though, one could feel.
With uniquelist=false you get
Adams et al., 2015b
Adams et al., 2015a
which is compact, but somehow disguises the fact that the articles were written by different authors.
MWE
\documentclass[11pt, a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[british]{babel}
\usepackage{csquotes}
\usepackage[style=authoryear-comp, natbib, maxcitenames=2, maxbibnames=999,
uniquelist=false, dashed=false, backend=biber]{biblatex}
\begin{filecontents}{\jobname.bib}
@article{adams1,
author = {Adams, J. and L. Hill and J. Jones and K. Lamar and T. Wang},
title = {A Nice Title},
year = {2015},
journaltitle = {Journal of Articles},
volume = {10},
}
@article{adams2,
author = {Adams, J. and L. Hill and J. Jones and K. Lamar and A. Walker and T. Wang},
title = {Another Nice Title},
year = {2015},
journaltitle = {Journal of Articles},
volume = {11},
}
\end{filecontents}
\addbibresource{\jobname.bib}
\begin{document}
\cite{adams1}
\cite{adams2}
\printbibliography
\end{document}
Which look you go for in the end should ultimately depend on the style you need to follow or what you find more æsthetically pleasing.
While the short citation might make it look like the articles were written by the same set (or tuple) of authors at first, I think a reader can be expected to look at the full bibliography at the end to find out that this wasn't the case (she will have to refer to the bibliography to get the full details, anyway).
The long citations can break the flow of the text and add little extra information compared to the length it adds.
You need to consider how important that added information is for you.
That said, a deeper discussion of the merits and demerits of the two approaches is probably better suited to Academia.SE or Writers.SE.
uniquelist=falseinstead ofuniquelist=minyearwhich as you say cannot work here because of the same year. (See Biblatex: Have only one author in citation — multiple articles with same first author, different year for example.) – moewe Nov 29 '15 at 10:24