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In paint tool SAI I use blots&noise often for sketching and lining, gives it a bit of texture. Personally I move between them both for certain brushes etc. The 3D modelling pose tool also is great! I'm not a CSP veteran so idk a lot of stuff other than basics, but a lot of my friends have moved to CSP and like the options there a lot.
![paint tool sai brushes deviantart paint tool sai brushes deviantart](https://i.pinimg.com/originals/51/b5/d5/51b5d5f8036905cbcbb2242e86187fec.jpg)
Also the perspective rulers are simple and easy to use.ĬSP though has a lot more options - you have a very nice asset store rich in many resources. Also one thing I use heavily that I think is better in SAI is the fringe layer option (never looks the best for me in CSP). I prefer how brushes blend in SAI, even when I was using CSP one of my main brushes was a brush called "Sai" made to mimic how it feels in it xD. Now I'm a simple person, I use simple tools - for me, I feel like SAI is enough because the brushes they offer though they are more limited in selection they do their job well. I have used both, SAI2 has been better for me than 1 because of the 64bit option, to me actually that makes it much more stable and can use a lot of RAM unlike the older version. I feel like a lot of it comes to personal preference and needs tbh.