[CentOS] PHP 5.3: IUS vs CentOS repos

I need to upgrade PHP because the latest WordPress requires one at least at 
5.2.4. What are the tradeoffs of using the php53 packages provided by 
CentOS versus IUS? I've seen that installing the RHEL-derived php53 
requires removing php first and it creates package conflicts because it 
doesn't provide a virtual php-common package. That suggests I should 
install the IUS package. Is there any reason to avoid IUS and stay with the 
CentOS package?

<http://www.bytebot.net/blog/archives/2011/07/24/updating-php-in-rhelcentos-5-6-for-wordpress-3-2>