I've always used a larger mouse icon in Windows (made it easier to find when zipping around multiple screens :p). Recently switched to using OSX and discovered that the option to enlarge the mouse icon does just that, literally.
It just zooms the mouse up... Normally this wouldnt be an issue, except when I use photoshop, the icons are all larger than their effect area (ie, brush size is inaccurate) due to the mouse literally being scaled up.
Is there another application that can replace the system mouse rather than just scaling it up??
If you open System Preferences>Universal Access>Mouse & Trackpad, you can adjust the cursor size to be larger. To my knowledge, there is no third party application that will do this since it is allowed natively. Hope this helps!
Occassionally I use Mouse Locator when giving demos to help the audience track my mouse movements. Mouse Locator doesn't increase the size of the mouse pointer per say, instead it "paints a target" around the pointer when you start moving the mouse. The target makes it easier to locate the pointer location. Omnidazzle also does this, but the effects are flashier.
Yolo mouse, It can change both size and color you are also able to change on the fly. You can also import different styles and use them ans well in small medium and large.
Presentify doesn't change the cursor size but can be helpful to locate your mouse on your Mac. It has a lot of other features too and may be worth checking out.
Disclaimer: I am the developer of this app.