Its a personal thing,
I only use gardiners brushes, ive got,
The extreme, my favoured brush for windows.
The dial trim mono super-lite, used mainly for gutters/ fascias conny roofs.
Extreme flocked , softer brush, i use on old georgian windows with poor paint work.
Super-lite d/trim flocked, dont use this that often, but there if i need it.
Hope this helps