There isn't enough space(or room) on the board to write all the sentences.
which one is best? or both is correct?

Question

There isn't enough space(or room) on the board to write all the sentences. 
which one is best?  or both is correct?

Answer

Either will do.

Answer

Both are correct, but I think the better way to write or say this would be “There is not enough space (room) on the board to write all of these sentences."