How you say the “adquisición” part would very much depend on the rest of the sentence, but “acquiring” is one option, if it’s similar to the following examples. I would say “edge” rather than advantage (see no. 5, below).

edge adj : at or constituting a border or edge; "the marginal strip of beach" [syn: {edge(a)}, {fringe(a)}, {fringy}, {marginal}] n 1: the boundary of a surface [syn: {border}] 2: a line determining the limits of an area [syn: {boundary}, {bound}] 3: a sharp side formed by the intersection of two surfaces of an object; "he rounded the edges of the box" 4: the attribute of urgency; "his voice had an edge to it" [syn: {sharpness}] 5: a slight competitive advantage; "he had an edge on the competition

In this environment, size alone will not be the decisive means for
acquiring a competitive edge. Rather, success will come through the
ability to secure new markets speedily and resolutely by focusing the
business and reshaping products and channels to market.
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Hope it helps.