(for reference, i am an inkbrush main)
this guide has a lot of viable tips, such as keeping hidden, flanking enemies and assassinating enemies when using the inkbrush as this is the most effective way of using this weapon. another subject covered in this guide is the subject of ink flicking, and the fact that having a good trigger finger can make your rate of ink-flinging very fast, fast enough to quickly splat people and fend off krakens. this is a benefit of the inkbrush that many seem to overlook due to lack of practice with the inkbrush. i also completely agree that where the inkbrush shines is in turf wars. it can cover so much ink, with an average of 1,000 points per round when you really get some practice with it. it is an absolute inking machine in turf wars.
some of the recommendations i found to be a little lackluster in highlighting the inkbrush's abilities, however. an example of this is when it is recommended not to use the inkbrush in rainmaker mode. to me, this is one of the modes that the inkbrush excels in, because of its speed and ability to make paths for your team to follow , quickly secure the rainmaker, and get into the enemy base by following your inktrail. no other weapon has this advantage (i'm not considering the rollers because they are much slower than even the octobrush). despite this, though, this is a pretty good overview of the inkbrush, and it gives a good idea of what kind of playstyle to adopt when using it.