Which helps more in building a brand-Advertising or R&D?

Obviously R & D is most important factor in product development.Brand advertisement of any bad quality product may for very little time impress people ,but ultimately one day it will have to go down and ruin the business.R & D will never result in bad results at all as its motto itself is development.

Advertising without a strong and effective product / service base is of no use.  I guess you need to invest substantially in R&D first and then invest in advertising.

Every brand that is put in the market for success after the business plan has to undergo a series of R&D tests. Because a brand needs a positioning and a trigger for it to be tried.

Advertising would naturally come after as R&D would give us the measure of the brand and its positioning with the TG and also a way forward. Most commonly used is a 'vox populi' or 'dip stick' which gives us a direct consumer insight on the brand albeit indifferently as the brand is really not exposed but its strengths are. The interesting point is that these studies are generally conducted with direct end users and vis-a-vis the competition. R&D would certainly mean a 'WAY FORWARD'.