IOS – What stylus is good for taking notes and writing equation

I frequently need to take notes and write equations. I never draw any thing other than graphs, diagrams, etc.. like board works. I am not a painter. I bought an Adobe Ink for my iPad (not iPad pro). Tried to use in one of the Adobe softwares. It looks like that is very good to paint or sketch. But when I try to write some equation, often it jumbles up with subscript notations. It applies its intelligence to turn my x into n. iPad's own notes app works slightly better. Instead Microsoft Onenote works much better. But still even with onenote things don't work to my expectation. I thought I would be able to take notes straight away. But it is nothing close to that smoothness. If I write very slowly ike painting letters on the board then it somewhat works. Should I change my stylus for a better experience ? Are these styluses optimized only for painting ? What budget stylus is good for writing and taking notes ? Or if it is more or less same for all stylus then I would not bother buying another one.