I think PHP OO is the easiest way of setting up a larger project. If you're only using some PHP in a website, it's quicker to do it procedural style.
That being said, on a larger project OO is definitely worth the extra time-investment at the start, as it makes handling objects (whether it being a blog-post, shopping cart or whatever) so much easier once defined as an object. It also makes code more readable IMHO. I've just rewritten a procedural style function call in a page to an object, which changed my pages code from
function($a, $list, $with, $thirteen, $POST, $variables, $all, $related, $to, $a, $blogpost);
I rarely use procedural style any more when OO gives me a clearer view on the matter. It's still a programmers choice though and I suppose you should go with what you're comfortable with.