First, decide upon the Comfort Option (Plush or Firm). Up next is the Top Style (Tight, Pillow, Euro, Euro Pillow). And finally, decide on the Coil Type (Open, Integrated, Pocket). All three dictate and control the overall comfort of the mattress you will decide upon.
In terms of choosing between Firm or Plush comfort option, the average person will prefer Firm. Plush is a softer, more cushiony version of the industry standard comfort.
A tight top is a bare-bones mattress - it has no extra topping at all. Generally, tight top mattresses are firm-feeling as there are only a few inches of fibres between you and the coil system.
Has a few more inches of padding than a tight top, like a single layer of pillowing. Can be made of foams, fibres or a combination. Softer than tight top, but you can feel the support.
Has several more comfort layers than pillow top with no gusset, it's a softer version that is initially comforting. Looks like a small mattress is on top. Made of foam, fibres or a combination.
A combination of euro & pillow top. Generally the plushest, it looks lofty (several inches in height) & feels like sleeping on a cloud. Can be made of different foams/fibres & even other coils.
This hourglass-shaped wire coil is joined to adjacent coils by small wire spirals called helical. The open coil design provides good initial support.
With integrated coil, each row of coils is made of a single wire attached to the next row. It's often made into honeycomb shape to allow more coils which can deflect weight.
Pocket/Independent Coil is a cylindrical spring wrapped in a fabric pocket for more contour. Each coil is independent, creating less disturbance when someone moves.