I used this howto for setting up Tomcat to provide the Solr service while using the out of the box Tomcat6 from the normal Ubuntu channels. I'm using Jaunty. I've highlighted a couple of things in the process.
Personal-Writer.com provides writing and editing services to English-speaking customers wroldwide. Services include academic writing/editing, web writing/editing and business writing/editing.
Looks to be a pretty fair and balanced comparison. Having said that, I've never even downloaded Übercart.
The comparison seems to be fair as she says she's used both, and isn't pushing one harder than the other. Looks like the choice needs to be made on a site-by-site basis