Pan F is sharpest of the 3, it's slower by a stop as well. Adox CHS 50 is closer to being a 100 EI emulsion the 50 in it's name refers to it's Tungsten light speed.

As Adox/EFKE 50 is no longer made I'd personally go for Acros of the two as Pan F is limited to 35mm & 120, however if I only shot miniature formats I'd standardise on Pan F.

One of my friends shoots Pan F and develops in Perceptol diluted 1+2 - the results are outstanding.

Ian