We have used the Oliveri Santorini black mega bowl in many of our projects and have always found them to be a great sink and our customers have been very happy with them too. One thing we always do when preping them for installation is to use epoxy when fixing the brackets to the sink.
Unfortunately I can't comment on the Franke Maris granite sinks though, as we have never used these. When we find a good product, we tend to stick with it. Sorry, perhaps someone else can comment.
Compass Kitchens
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