The old menus are a lot clearer, you get more information on a page without the large unnecessary graphics and oversized fonts. It is easier to find the parallels in the old layout, which is what I mainly use the site for these days. The new site seems to be designed to limit the amount of information that you can get in any one go. This is a common theme in webdesign in the last few years. I see it everywhere nowadays. It’s awful.
For example, from my bookmarked page, I click on one menu to get sutta texts, one more click gets me the whole of a Nikāya and all the parallels on one page. Say I want to look at something in the Dīghanikāya, compare the different approaches.
Legacy: DN: Dīgha Nikāya - SuttaCentral - 13-15 suttas per screen - 2 page downs to see all.
New: SuttaCentral - 1 to 1.5 suttas per screen - 19 page downs to see all.
The new site is about ten times slower to use and involves many many more clicks or scrolls. So while the legacy site is there, I’ll keep using it because it is far superior to the present one (ten times better at least).
However, it is good to know that the back end was changed as well as the front end. That does make a difference, because it means that the content is out-of-date despite the layout of info being far superior.