I haven’t, but to introduce a sordid element of pragmatism, if you came to sell it later the 39mm would probably shift more easily as most can wear one, where a 42mm suits larger wrists better.
I can’t help feeling that if you do get replies from people who tried both as to which they prefer those may be largely determined by wrist size, so quite personal.
All that said, from a purely aesthetic perspective I think the dial of the 42mm looks better, because the larger size allows more spacing between the numerals. On the 39mm things look a little bit cramped by comparison.