Ortlieb or Overboard?

The dry bags from Ortlieb're now well known and beyond doubt. The Overboard brand was hitherto unknown to me, yet I dared and if the Overboard preference. And so far I am very satisfied.
Quality and feel are top. Practically, the more breakpoint and the strap.
Why these and not the Ortlieb 5 liter bag?
Let's look on weight. The Overboard weighs over twice as much as the Ortlieb. This is then found primarily in the material thickness again.
While the small Overboard approximately the same material thickness as the big Ortlieb bags, the small 5 liter bag of Ortlieb is much thinner.
The Overboard is therefore very stable and robust, it can not roll up indefinitely. Here scores of Ortlieb, because it can be rolled up at least once more and is still good to close.
Furthermore, the Ortlieb bag has a carrying on the ground in order to angurten him again stable can.
So, my conclusion: Variable compression and felt more secure attachment - Ortlieb.
Unconditional robustness at full volume utilization - Overboard.
I hope I could help.