I guess it depends, most tourney players say to use whatever you're used to. Most of them play at the arcades, so they use sticks. I haven't used them consistently for about 14 years, so when I got sucked into the SFIV hype and bought a stick, I realized that I wasn't used to them anymore.
in short, sticks were a big marketing ploy by markman to get you to buy the $150 SFIV stick. Hopefully you realized that before people stopped buying them for $400+ on ebay.