Poetry wise, Charlotte is the less impressive. She didnt had Emily mysticism and strength neither Anne softness presence. As prose, of course, Wuthering Heights was way advanced for her time, dabbling with the psychological novels that the russian would yet produce and of course, Heathcliff is a strong character, that can play with our imagination all the time. Charlotte seemed to agree that Emily poetry was stronger, as Emily kept it hidden from her family, and when she showed they felt like hit by a strong blow. But still, all 3 Bronte girls were impressive minds, watever was in the water of that family should be give anywhere.
Of course, Brandwell is more famous for his portraits of the sisters, but I supposed the lack of "Propaganda" of his works is due the lack of quality if compared to his sisters and a bit, a counter-effect to the whole argument he was the writer beyond their works. He also teammed with Charlotte in the juvenile storytelling plays, while Emily and Anne were the other team (Gondal stories i think for them and Angria for Charlotte and Branwell) and we have to addmit the other team seems to be the stronger one. Anyways, hard as it is sometime to find, here one of his poems
I sit, this evening, far away,
From all I used to know,
And nought reminds my soul to-day
Of happy long ago.
Unwelcome cares, unthought-of fears,
Around my room arise;
I seek for suns of former years
But clouds o'ercast my skies.
Yes--Memory, wherefore does thy voice
Bring old times back to view,
As thou wouldst bid me not rejoice
In thoughts and prospects new?
I'll thank thee, Memory, in the hour
When troubled thoughts are mine--
For thou, like suns in April's shower,
On shadowy scenes wilt shine.
I'll thank thee when approaching death
Would quench life's feeble ember,
For thou wouldst even renew my breath
With thy sweet word 'Remember'!