for sure coding for wordpress is way easier! it's way more simpler than joomla! wordpress it just a blogging script but Joomla is a complete CMS(Content Management System) with many components! to me Joomla Vs. Wordpress is like Windows Vs. Media Player! you can program much more for windows but the max you can do for media player is some skin or lyrics plugin!and for sure programming for windows is a little harder and bigger than just media player!
WP. I can turn it into a powerful CMS, though it is just a blogging tool. Simple, effective and perfect for smaller needs. ~G
joomla is a CMS... which you can use as a base for a user management based system.... we had a video coding project once to be similar to youtube but with a payed for twist to it all.. it used joomla as the base for users etc.. with a module to do the videos and what not Wordpress is a blog... either way wordpress is extremely easier to use
If all you need is blogging, then WP is right for you. But if need to have more advanced feature such as online store, download management etc, then Joomla is far more than enough. Joomla is the BEST CMS for me.