Laowa or xtract?

I have to achieve an extreme close up shot of an eye ( the iris and nerves around it must be visible ) as a part of my thesis project. The vendor has given me two options for probes , the laowa one which is kinda cheaper and the dzo xtract. Considering the complexity of the shot , which one should I go for ? Or can this shot be achieved with macros with longer focal lengths?

Also what should I take care when I'm lighting the subject so that the actor remains comfortable assuming I have to use more light for this shot.