What's the difference between that search and the other one if all they both do is search titles?
I like that one better because it actually categorizes and gives you an image of the game. The other search (search bar, I am assuming you are talking bout in the default top right) gives you thread titles when looking for a word or phrase.
I mean, they are both good in their own rights, but the Latest Games & Updates I enjoy more given the 'preview' state. Also, you can filter it with tags when using it, including excluding tags you do not want to see in a game.
Another reason I use that search engine is to see the recently updated games without adding any searches. Whenever a game gets updated by a mod, it automatically gets bumped to the top of the list.