Website, DB, & Software Developers

It really is about personal preference. Some addons (modules/apps) are more readily available in Joomla than Wordpress and vice versa. It depends what kind of site you are going to build.

On the whole I found Joomla to have a steeper learning curve but was very robust at building a large content management site. Wordpress was easier to get your head around and I would have built high quality websites with.

Just two other things to mention both have their own distinctive way of doing something and it feels like you are hitting your head against a brick wall because you just want the site to perform in a particular way and can't find the exact module/addon that fits the bill. You do need to be adaptable.

The other thing is to ALWAYS ensure your security is uptodate, a couple of my sites have been hacked and destroyed because I didn't apply the latest security patches (sounds simple but when you are managing a number of sites it can happen).

hope this helps.