Can confirm. Have both systems and buy digital games on both, Xbox One downloads are super fast, PS4 downloads take forever. If you set up your PS4 to download in the background and put it into rest mode they do go faster, but they are still way slower than they should be and much slower than Xbox One, even if I’m playing an online multiplayer game on the Xbox while downloading the new game.
PS4 also has that weird thing when it downloads game updates where it seems to be calculating some kind of patch delta (“Preparing to Download” status), which you would think would be a good thing because the service download speeds are so slow, but whatever they do to “prepare for download” can literally take hours sometimes. I’ve had similar size Destiny updates/DLC pulling to both systems at the same time and the Xbox One will download the patch and have it installed in like 5 minutes and the PS4 will still be “Preparing to Download” like an hour later, and then when the download finally starts it’ll be another 30-45 minutes.