In the latest edition of their firm's Head to Head series, Citi analysts Kate McShane and Corinna Van der Ghinst say Nike (NKE) wins on most metrics when compared to Under Armour (UA) and Adidas (ADDYY). All three brands will likely benefit from "solid" global category growth over the next several years, but Nike still comes out on top given its "consistently strong sales growth and global market share leadership, powerful digital presence," margin expansion potential and attractive relative valuation, McShane and Van der Ghinst tells investors in a research note. They view the 14% pullback in shares of Nike over the past four months as an opportunity to invest in a "best-in-class global secular growth story." Citi analysts have a Neutral rating on adidas and Buy ratings on both Nike and Under Armour.