Check the quality of your locks ! I suspect both to be breakable with a bolt cutter (yes, your u-lock too).
You will learn more here :
For owners, a second option is more onerous, but will not benefit only to you.
- Install a camera.
Put it high enough to reduce the risk of being destroyed.
Be sure to have access to data even if it is destroyed.
This may even protect the whole garage, not only bikes. - Install a swipe card system to enter and leave, thus a thief will not be able to get out with the bike.