It appears that TIFs are slightly less focused (more blurred) than their JPG equivalent.
My bot uploaded these two files:
The JPG one was converted from the tif with imagemagick (python):
call(['convert', 'currentfile.tif','-quality', '97', 'currentfile.jpg'])
Although the jpg is 97% of the tif quality, it appears to have better quality.
Am I mistaken or is there a reason for this?