I like both, depending on their use. For sociability, the swivel are great. For writing or some other, more 'stationary' function, the stationary are it. The swivel is too much work to keep it stationary!

A Swedish company does this style which can be customised by colour, see below photo

Funny you should say that Ellie , I did exactly the same with a string of Christmas lights . i bought a set from them at around £50 then when they arrived they were in a branded box which I googled and found them at half price elsewhere ! Sent Cox and Cox’s back.

The swivel ones usually have a lever that activates the gas that allows it to go up and down. The gas mechanism is usually within the middle pole. That way you can adjust the height. I have seen some that adjust the height by swivelling round, swivel one way the seat goes up and swivel the other way it goes down.