TG-4 + the led light guide, even illumination without the need for a ring flash. The other flash diffuser is not really designed for macro.
Also use the built in focus stacking feature.
I use an old OMD E-M1 with the Oly macro lens also with built in focus stacking. The only trouble with focus stacking is that nothing must move during the multiple exposures, so its not always available.
The seperate macro lens does give you more of a chance with things like nervous insects.
Really depends on what you are shooting and the distance involved as to what works best. On the TG it is labelled microscope mode for a reason.
For ad-hoc close ups I often use my old faithful Canon Ixus - 960 Titanium, a mere 12 years old and still in regular use! Obviously not as weather resistent as the others.