... According to my personal experience (many people know these facts), at least half of the teachers in Shenzhen, Dongguan and other areas, whether in private schools or public schools, speak Hakka (that is, from Hakka areas), but I have never met any teachers who speak Chaozhou dialect! I've never heard of it. Chaoshan people who are active in the Pearl River Delta are basically doing business, and many of them are doing big business. I have been teaching in a private school in Dongguan for one year. Parents from other provinces do everything: they are managers in factories, ordinary workers, and vegetable sellers in vegetable markets ... And all parents in Chaoshan are shops, and they are all a little large. I have never seen any parents in Chaoshan who are not in business!
... So, from my personal experience, I dare not say anything else. In Guangdong, we Hakkas (represented by Meizhou people) are really more "literate".
... another thing: small, otherwise, I think your question is not rigorous enough. Hakka people are scattered in Guangdong, and the proportion of them is also large. Not only in Meizhou, but also in Heyuan, Qingyuan, Shaoguan and Shanwei, there are many Hakka speakers! Also, Longgang District in Shenzhen, Qingxi, Huangjiang, Fenggang and other towns in Dongguan all speak Hakka. These are all Hakkas! However, it is not surprising that the situation in different places may be very different from each other, or even completely opposite. So, in fact, it is difficult to have an ideal answer to your question. If you want to be interested, it may be more interesting to discuss the similarities and differences of Hakkas around the world.