I've been through all of them (except the Apples ...).
The Givis survived a crash at 70kph with nothing but a scratch, but they bounced terribly on bumpy roads. The 3rd box was almost empty and was a great place to store the jacket when exploring on feet.
The Zega cases are toploading, once you've had that, you won't accept anything else. But in the dirt, it really hurts if your legs are trapped underneath. I've had one come off at 150kph due to stupidity. Almost empty, except for a SLR - nothing was damaged.
These are lockable soft bags. The straps are a bit unconvenient, but no complains other than that.
For me: soft on gravel, alloy on the road.
By the way, if you have hard boxes on a tough rack, all the stress of a crash will be directed to the bike's frame. Stronger is not necessarily better ...
spip
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