I have a lot of Joomla sites and WP sites. I started with Joomla when it was still Mambo.
Smaller: Size: Joomla sites starting with about 20-30mb, whereas WP with 60-80mb minimum.
"WP beats Joomal in default installation without extra's." --> absolutely disagree, because: You have to add a lot of plugins to WP to be able to do the same what Joomla does out of the box. And at minimum you have to add several plugins only to be able to normaly work with it, just a few examples: changing order of articles, duplicating articles, cache cleaning, ..
More secure, because the code is written only by a handfull developers and much more overviewed since the beginning. I have to update my customers Joomlas maybe 1x all 1-2 years because of really hard flaw, or zero day exploit. With wordpress I get stress when I update them not in 2 monthes. I had 6-8 wordpresses hacked in the past few years, whereas my last Joomla hack was about 8 years ago with Joomla 2.5 (and that was not even Joomla itself, but a form component).
The structure in components, modules and plugins makes it much more clear what the software is doing where, and it mirrors it in the menu system. In WP you have all in the mainmenu, no matter what the plugin does, and its not ordered at all in any logical system. In Joomla you have the components (full features programs), modules (widgets in WP to show content), and plugins (functions).
WP makes it easier for programmer wannabes, and thats why there is so a bunch of vulnerable plugins. Joomla needs the programmers to have a learning curve, and to fit their plugins into the system. The most Joomla plugins are much longer on the market, and therefore much more stable.
The bad thing for Joomla was after the 1. generation of developers (1. generation: Mambo, they wanted it make from open source to commercially, and the developers splitted in parts, with a part maintaining it opensource on the new name Joomla). The 2nd generation was the problem, they wanted to make more money and started to change the search-feature on the repository, so that newcomers could better promote their (most not so good) new plugins, whereas the older good high rated plugins dropped somewhere in the back. That was also the time, when WP arrived, and lot of developers changed from Joomla to WP, or developed plugins and themes for both. That leads also to the fact, that you have to pay for more Joomla plugins nowadays, as in the previous time, and on WP much more plugins (or with more functionality) are still free.
Usage and speed: Joomla needs 2-3 plugins for a full featured site, WP needs 10< plugins, I have even sites with 30 or more plugins. And with that comes security and needed updates, lot of updatework more for WP then for Joomla, speedloss. In WP scripts are often loaded on all sites, no matter if the sites uses the feature or not. This makes most WP sites slower and slower with the amount of plugins. In Joomla they are loaded on the site where they are used, and not on all sites. I have to do also a lot of more work in speed optimization for my customers on WP, than on Joomla. I see often a size difference from ca. 1:5, only for the plugins and same features on both. And with the many many plugins needed in WP, you get security flaws for free much more often.
So yes, after all, cleaner, smaller, faster and more secure.
But if you have time: make a comparison between standard WooCommerce and standard eShop (ok, eShop costs 40 bucks, but when you need to buy all the plugins for WooCommerce for the same functionality, compare again)
Edit: just added my .txt lists with the updates (over all my customer systems) for each system for the past 5 years, and only the size of this textfiles with the lists differs remarkable: 25kb for Joomla, 150kb for WP