(modern) betas uses auto detection and a driver which was adopted by @jernej to work on H3 boards and a kernel make use of this screen initialisation (simplefb driver). Video driver has certain limitations, but for normal work is perfectly fine.
On kernel 3.4.113, we use stock video driver provided by Allwinner and patch by community. They support only few screen sizes, the rest was added by us.
If you don't need to watch movies or play games, stick to betas and forget about ... otherwise start with the task list
José M González reacted to Igor in Orange pi lite screen problem