I'd go with either.
To me the PAGE DOWN legend looks too big - it is pushing against the edges of the keycap.
Curiously the GMK set I am using now (Cherry legends) Pg Up and Pg Dn are abbreviated, but the upper right 3 are not (well, Prt Sc on one line and Sys Rq on the second). But I will admit that the legend fonts are the same size.