Active Stylus vs Non-Active Stylus
Non-Active Stylus simulate finger. Advantage is that it's cheap and simple. Problem is: you have to hold to do a right click, which is very frustrating because sometimes it doesn't work, and also it's difficult to make a text selection.
Non-Active Stylus simulate finger. Advantage is that it's cheap and simple. Problem is: right-click and text selection is difficult or impossible. You have to hold to do a right-click, which is very frustrating because sometimes it doesn't work at all. And often you need to mak a text selection, and right-click on the selection to lookup/search the phrase. Sometimes, when you hold to right-click, you deactivate the selection, making this impossible.
Active pen typically require battery (or rechargeable), have buttons on the pen, can work as eraser, and is pressure sensitive, can do right click, can drag to select easily.
most importantly, with active pen, you can write or draw with palm on the tablet, and you have dedicated right click, often necessary.