If one needs to slightly increase the size of the text in a TikZ node. What are the pros and cons of using
scale= in the style options instead of changing the font size with the usual LaTeX\TeX macros:
Scaling affects all the glyph strokes and this can be not very pleasant (some strokes will be unnecessarily and excessively thick); changing the font size using the font switches or
Compare the results in the following simple experiment; the upper line uses
Of course, for a small scaling factor the difference can be almost imperceptible, but I'd use the font switches for better results unless, of course, one is specifically after the effect produced by scaling.
Addressing this same situation, D. Knuth mentions on the fourth bend sign on page 16 of the TeXbook: