Equivalent mattresses to Vispring Elite and Vispring Regal Superb

I have tried out the vispring elite and regal superb mattresses in comfort level soft...
With both of these it was very comfortable laying on my side - the filling levels were nice and deep.
Which would you say were your equivalent mattresses to these please?
With a lot of mattresses I have tried out - it seems like they slope towards the edge - which
I am not very happy with...
Please confirm yours do not have this aspect.
This facility to ask questions is great - thank you for your help!