In terms of market share, Unicast is clearly lagging behind, losing to Visible Measures in all segments.
Visible Measures has better usage coverage in more websites categories. Including Business & Industry, Software, Computer & Electronics and Marketing & Advertising.
Unicast is leading in Performing Arts and Arts & Entertainment.
Visible Measures is leading in most countries, including United States.
Unicast hasn't got a lead over Visible Measures in any country.