Agree with recommendations. I went wfp just less than 2 yrs ago. I purchased 2 poles, 1 hybrid (mix of carbon n fibreglass) and 1 carbon. Not really used the hybrid much and the carbon became the every day pole. Im just shy of 6ft and my pole i think is between 20 n 25ft (cant remember) but my height n pole i could clean all windows on a normal house, reach over conny roofs and extensions ok. But there were ones i had to use a box or A frame ladders as extra height was needed.
Begining of this month ive now got the slx25 which easily covers all my needed range. Its a firm but light pole, more so if you pick a light brush, which does make all the difference to a light pole.
If you can afford it, dont waste money on fibre glass and best you can always go carbon, not much flex in pole, it will go where you want it to and you will be thankful you spent that little bit extra.