The "best" format would depend on your needs. What your system and software can handle and what are the necessary or likely effects that will be added in post. If you're not doing heavy color edits or don't have the system resources then 8bit .tif should be fine.

Personally, I prefer 32bit .exr. When the pixel value range isn't clamped between 0 and 1, it makes for more flexible source material (better looking blurs, color corrections etc). The files can get quite large and some programs slow down more than others when working with them so then there is the issue of even having the time.