Formats and concentration
Attar vs perfume spray
Attar and perfume spray differ in presentation and may differ in carrier, composition and application. Attar is used broadly in commerce, so check the actual product rather than assuming every attar is natural, alcohol-free or identical to a spray version.
A HUME Fragrance buying guide

Check what is being sold
Read the maker's description of the formula type and application. The word attar alone does not verify extraction, ingredient origin or the absence of alcohol.
Compare the application format
A dab or roller and a spray deliver fragrance differently. There is no universal conversion from a drop or swipe to a number of sprays.
Compare wear rather than labels
Try the exact products you are considering. A longer-lasting or more noticeable experience cannot be guaranteed simply from the attar or spray name.
Try this before you buy
Record carrier claims, application method and exact product identity before making the comparison.