This depends a lot on what you want the scissors for, a bit like with knives !
It is no use buying a bread knife to use as a filleting knife.
So the traditional all metal scissors are made from Carbon steel, forged and nickel plated, or Chrome over Nickel plated, so not to be used in wet conditions. If you want to do tailoring work cut heavy weight fabrics this type is the best.
If you want a pair for around the house, then the lightweight (or plastic handle ) are the best option , with stainless steel blades.
Price often depends on how thick the steel is used on the blades, 1mm is fine for embroidery scissors, but it needs to be 2.0mm or more on dressmaking or Kitchen shears really.
Fiskars are OK, but the joint is a rivet, so I would look for one with a proper screw joint.
Kai from Japan make better quality dressmaking scissors with a smooth action, and you can get soft grip type handle, the pivot is strong, and they are about the best in my view.
Victorinox do nice scissors as well as you would expect from this top quality Company.
Mundial scissors are all so good value/ Quality with there red spot range for every day use.
For the all metal forged shears,Tailors type - Wiss & Mundial, are good.
There are a great many specialist scissors for different tasks, just as there are knives.
Left hand scissors of course are vital for left handed people.
The edge on scissors is not like a knife and most sharpeners will damage scissors blades, so best not to try and do this at home.
As a family we have made, and sold scissors and cutlery products for over 50 years.
Hope this help a bit !
best wishes
John