When I'm choosing a brush, the most important factor is which brush scrubs the best with minimal effort, if it bounces across leaded windows in either direction, then weight, then last of all how long I can use it before it falls to bits.
Also, gardiners jets are fitted too close together if using four jets, they need to be spaced out more equally. My favourite brush is the newish one that streamline brought out a few months ago as the bristles are brilliant for scrubbing, the jets are equally spaced out, the jets can be fitted or removed in seconds and the build quality is far superior. IMO it is better than xlines brush that everyone raves about hence why xlines brush is my second choice and gardiners comes fourth after tucker brushes.