Shelley was more idealistic than Byron. true or false?

True, no defines each them by a single poem

The correct answer is true.

Indeed, Shelley was far more idealistic than Byron. Both of them were Romantic poets, however, Byron was a lot more cynical and realistic about life than Shelley. Shelley, on the other hand, had a more positive outlook on life - their stances about life and idealism/realism are evident if you take a look at their poems.