If it's a private locked garage, why the shed? If they've got in to the garage, the shed won't bother them. I suppose if it's one of those non description metal numbers it would just look like a maintenance locker or something. Although that may look like it has expensive tools in it so would be even more attractive. I would be inclined to put a chain and a cable around the pillars (potentially needing different cutting/breaking tools) and lock to those.
Because I like neatness and order- seriously- thats the reason, there are no bike racks in the garage, and though its secure, I still want my bikes stored properly- even though it will just be my beater and the gf's beater.
I like having ease of access, etc.
If it's a private locked garage, why the shed? If they've got in to the garage, the shed won't bother them. I suppose if it's one of those non description metal numbers it would just look like a maintenance locker or something. Although that may look like it has expensive tools in it so would be even more attractive. I would be inclined to put a chain and a cable around the pillars (potentially needing different cutting/breaking tools) and lock to those.