" What is the best and safest duplicate file finder " ?

I know how most of you feel about duplicate file finders...they are really not safe and it is best to just leave duplicate files alone...I somewhat agree, however, I would really like to try a really good and safe duplicate file finder that is " relative safe " in your opinion. I was thinking of a color coded program perhaps that maybe had ' green ' or some other color as SAFE to delete. Thank you all in advance for your help with this!

 

Also looking for same.
Perhaps "duplicate" text docs would be among the safer to delete?