There's a youtube channel called Lock Picking Lawyer, which is primarily focused on how easily common locks can be picked. There is a lot of attention paid to bike locks, though, and it addresses a lot of common ways to defeat the locks with modest tools.
https://www.youtube.com/channel/UCm9...8W8JigLoZOh6FQ

In general, the cable locks can be cut with relative ease.
The Kryptonite U locks perform well, but are difficult to use in some situations.
Heavy robust chains are more adaptable to unusual locking situations but are rather resistant to cutting. Obviously, the weight is an issue.

Bosnian Bill did a review of the TiGr lock ....
About 14 minutes into the video, he demonstrates that a hacksaw can cut through the lock in about 15 seconds. Maybe it's harder when the lock is wrapped around a bike??

Steve in Peoria