I agree. Use a system. quality coatings and fabric at seams or field depending on the substrate.Generally the home centers are stuck fighting for sales over price. That forces them to stock less expensive products which are generally inferior. The products could have less solids, more water, etc.
Get a system, not a product. The system will include all of the pieces, a thick plastic roof cement product for prep, a base coat, a fabric to embed in the base coat, and a top coat. Don't rush it. Do the prep, then wait the prescribed amount of time.