Ais card belongs to Ais company, and happy belongs to dtac company. The travel cards and packages issued by the two companies are similar. The signal is similar in the city, and the AIS signal will be better in remote places.
However, most passengers will choose the Happy Card. There are all Tmall in China, probably from 30 yuan to 60 yuan. It costs 399 baht to buy locally in Thailand, which is slightly more expensive.