Bulgaria here. I don't know if the comparison is even relevant as we don't have normal mobile data plans anymore. Most of the plans are providing 5-10 GB of data to all networks and websites and some GBs to specific websites like social media and popular ones. So for example I can have a data plan with 20 GB but after the first 10 GB I have fast internet just for facebook and whatsapp. The rest of the internet is almost not accessible as it takes ages to load.