OP - Some wheeled skidsteers are inherently unstable, but the track loaders are typically very stable. One big draw back to me is that you cannot get out of the machine (typically) when the bucket is raised. Its a major safety hazard if you try, and most have so many lockouts and preventive measures, that its nearly impossible on modern machines. This is a big drag when you work solo.
The exception is the JCB and Volvo SS loaders. Who now have a telescoping boom which looks really interesting. If you have money burning a hole in your pocket, buy a track version of that!
For the record, my old Bobcat 753 was unstable side to side, but even more so front to back. The tractor is probably no better side to side, but infinitely better front to back. And I can get off the machine to hook and unhook items when working solo. Service is easier, implements are cheaper, WAY better visibility, better speed, and I don't feel that I gave up much other than ease of grading.