Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
Verizon added 1.3 million subscribers in Q2 2007 - http://money.cnn.com/news/newsfeeds/articles/newstex/AFX-0013-18250375.htm
AT&T added 1.5 million subscribers in Q2 2007 - http://www.att.com/gen/press-room?pid=4800&cdvn=news&newsarticleid=24132
Verizon added 1.6 million subscribers in Q1 2007 - http://www.lightreading.com/document.asp?doc_id=122848
AT&T added 1.8 million subscribers in Q1 2007 - http://seekingalpha.com/article/33332
Um... for Q1, 1.8mil > 1.6mil and for Q2, 1.5mil > 1.3mil.
I don't know what you mean by "outdo" but AT&T are adding more customers than Verizon.