Is there any other reason why you'd want to use DX or OpenGL? If not, then write your game and check the speed in DX. Even better write a demo with the number of sprites you're expecting and see what happens. If it's too slow try the OGL driver as it's a single command to add.
On the other hand you might want to use the DX9 driver which is out there somewhere and/or IndiePath's single surface TAnim module.
On the other hand you might want to use the DX9 driver which is out there somewhere and/or IndiePath's single surface TAnim module.