Formats and concentration
Perfume vs body spray
Perfume and body spray describe different kinds of fragranced products, but the exact formulation and intended use matter more than the names. A deodorizing body spray is also different from a product sold mainly to add scent.
A HUME Fragrance buying guide

Read the purpose on the label
Check whether the product is a personal fragrance, deodorant or another cosmetic format. Do not assume every scented spray addresses the same need.
Compare application and cost
Review the instructions, size and complete purchase price. A large body-spray container and a smaller perfume bottle cannot be compared only by the pictured size.
Judge the actual scent experience
If both products interest you, compare enjoyment and presence separately. Neither label alone establishes how many hours the product will suit your routine.
Try this before you buy
Write the purpose and directions for each product before deciding whether you are comparing equivalent needs.