Tiff or RAW

Indeed you would have to know how the TIFF file was created and how many bits. The best result will be to use Raw for initial editing. After tonal adjustments etc. in LR, I open the images in PS and they are rendered as 16 bit TIFF at that point. I continue editing in 16 bit TIFF and all the Plug-ins I use handle 16 bits. If I have reached the end of editing and know I will make no further changes, I may then save as an 8 bit TIFF. So I keep the Raw and TIFF files for the future to create prints or for use in projection or web.
Dave
Dave