Two editions of the same work can offer different reading experiences. Type size, page layout, notes and introductions all influence how the text is encountered. Before choosing, consider what you want from this particular reading.
Look at the practical details. Is the type comfortable, does the binding stay open and are notes easy to consult? An edition designed for study may be useful at a desk while a lighter copy suits travelling.
For translated works, check who translated the text and whether the edition explains its approach. Differences in wording can be meaningful, but a short sample is not enough to rank translations confidently. Read the available context rather than relying only on a familiar cover.
Decide whether supplementary material helps your present purpose. You may prefer to read an introduction afterwards if it reveals the plot. An edition should support your encounter with the work rather than make it feel necessary to complete every extra page first.