I worked with all .NET versions. The most none-code related .NET bugs I had to hunt down in modern time has been in .NET Core 1.0 (clear leader) and .NET Core 2.2. The thing I like about the LTS versions is that they always work in and with any part of the ecosystem. Actually, one of our clients had to downgrade from .NET 5.
What makes you say that? All versions of .NET - including non-LTS versions - have had an extremely high bar for quality before releasing.