You will probably find you will have your own preference after trying out different brushes. At 33 ft you will need to consider the weight, the superlite brush is very light but never tried them so I couldn't comment on them as far as how effective they are for cleaning.
I've used the vikan oval and sill brush which are decent brushes. (Wouldn't recomend the sill for 33ft) I tried the Ionics Crinkle mono dual trim which was great for scrubbing heavy dirt but it only lasted around 3 months, it very easily lost its shape and made it very difficult to rinse.
I've just bought the NEW Ionics Dual Mono and so far this is my fav. Reasonable weight at 30ft and really effective cleaning. by far the best brush I've used, around £21.
Been waiting for the new brush from gardiners and no doubt I will give it a try when it arrives.
Wayne
Wayne