if you have only few websites that offer content, sure, the one with the best content wins.<p>but iphone apps are a little different. they offer functionality more often than content. functionality can't vary by orders of magnitude as content can.<p>so you have many iphone apps that pretty much do the same things, differing only in minor features.<p>if the "primary" criterion isn't enough to make the decision, people turn to UX.<p>feels obvious to me.<p>if i had two websites (your example, not mine), and both offered almost the same content, i'd pick the one that appeals to me more.<p>that's how i made my choice of search engine. the major ones hardly differ in the quality of their results.