Since I found some time I'll write my opinion, that is how I think about it
gaming chair -> is aimed mainly at gamers, ie people who spend many hours on a computer.
Always a gaming chair is comfortable and quite adjustable so think of the chair you make it and the bed is very comfortable, before buying this chair I had a wooden kitchen chair that had the house and was not convenient at all.
Chair can be found from 50 € I imagine up to 350 etc
If you spend several hours at the computer I would recommend investing an 15 € in over 0.5 and 15-20 reps you could get some good, now what is considered good is relevant the most important is to do your job