I have had all manner of phones, ranging from 5000 to 40,000 baht.
My personal favourite, is the Techno Pova 5G, which I bought a few months ago, for around 6000 baht.
A huge battery, which lasts 2 days. A huge screen which an old man like me can see clearly. A huge memory 128 GB which can easily hold all my movies, pictures, music.
Amazing phone, for the price, but difficult to purchase, as it is always sold out.