IMO the king of the trackballs, Microsoft Trackball Explorer. I thought I had lost the ball but just found it - you can see the amount of use from how the paint
Microsoft Trackball Explorer D68-00007 2-Tone 5 Buttons 1x Wheel + 1x TrackBall USB or PS/2 TrackBall TrackBall - Newegg.com
Microsoft Trackball Optical 1.0 PS2/USB Compatible Missing Trackball PARTS ONLY | eBay
The 3 Best Trackballs for 2023 | Reviews by Wirecutter
CST KidTRAC Trackball
Microsoft Trackball Explorer
Microsoft Trackball Optical - Trackball Mouse Reviews