Make the important mark visible at its real size
For compact character lettering, a thin ornament or a small border, start by considering PC-3M’s stated 0.9–1.3 mm fine bullet tip. For a bolder decorative stroke or a less delicate filled motif, PC-5M’s 1.8–2.5 mm medium bullet tip is the more relevant candidate. These are ranges, not a promise that every hand or surface produces one exact width.
Sketch the design at the size it will actually be seen. A stroke that looks narrow on a zoomed screen may occupy most of a small letter once transferred to the object. That is a scale decision, not evidence that either marker is intrinsically more precise.
A broader first marker is not always more versatile for this job
PC-5M can be a purposeful first choice when the design mainly needs medium strokes and uncomplicated colouring. It is less convincing as the only purchase if the central task is fine lettering. Conversely, buying only PC-3M for a large motif may leave the desired broad marks awkward to build. Let the dominant marks, rather than a general “most versatile” slogan, decide.
Match the surface after choosing the scale
Both are paint markers, but the model code does not settle how a particular object should be prepared or how the finished design can be cared for. Verify that separate surface guidance before drawing on a valued item. Choose the finer or medium tip for a specific graphic need, then add another size only when the drawing calls for it.
Sources & further reading
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