I've owned an Eheim Hobby Pump, multiple QuietOne's and a Mag. All were used as skimmer pumps at one time or another, and the QO's and Mag were used as return pumps when they weren't on skimmer duty.
Most people's experience I've read of has the Eheim as the quietest, with the QuietOne close in terms of quiet. Mag's do have an occasional rep for vibrations, but that seems to be related to specific installations....predominantly people claim them to be quiet as well.
My experience with my four pumps that I acquired and used over about 8 years has been very similar to what I've read...the QuietOne 4000 was the latest...I think around 2 years ago.
I worked at a saltwater store for a few years and used and sold
many Mag pumps (among others) while there. I never had a single issue from use or from a customer with them.
As far as changes....I know Lifegard sold out to Aquatic Ecosystems, but I hadn't heard about the Sicce deal. (Not that it would be hard to believe.) When was that supposed to have stopped happening? Would AquaticEco have needed Lifegard without their traditional QuietOne line (which is now smaller, BTW....no top-end models) since they already have at least one line of Chinese pumps on offer? I know it doesn't have to make sense to happen, but...that wouldn't make sense!
Would be interesting to see them in action more, but I have never heard anything bad about a Sicce. I've never heard of anyone using Fluval pumps but I do tend to like their equipment.....Hagen seems to have distribution issues IMO. Again, speaking of the USA here....sorry.
Back to the topic!
From your list, Eheim or Fluval.
You might find a Tunze Silence pump available too as they do have a distributor in New Delhi...Aquazona Exports....check tunze.com...they list contact info.