I use an office chair my Doctor's office was giving away.It has no armrests, padded very well too. At my desk in the study, I have a gaming chair from a company called SecretLab,
https://secretlab.co/collections/tit...2020-targaryen. It is a gaming chair designed by gamers. They are a bit pricey but well worth it. My husband found the seat is too hard for him. He uses an office chair we bought from Staples, a Lazy boy Aberdeen.