I know the best tablet, and you can make it yourself
Take a piece of wooden plank
tape a piece of paper to it
write bluethooth or wifi connection on the side
Take your school pen and start playing
It will increase your reading and bpm abilities in an instant
The model is called pp nike by the way.
And for real now, you asked for the best tablets on the market so Wacom CTL 480 is one of the best for osu now.