racer style chair vs office chair?

Hello I bought a PC from here a while ago and I honestly don't know where I could ask and I guess it comes down to personal opinion, but I would greatly appreciate any opinions! I'm thinking of buying a chair for my gaming seshs. I do spend quite a lot of time on my PC and usually after 4 hours I get really sore back pains anyways I've narrowed it down to two,

http://www.argos.co.uk/m/static/Product/partNumber/1462551.htm?CMPID=GS001&_$ja=cgid:17470457433|tsid:59157|cid:199887753|lid:92277381033|nw:g|crid:65799073833|rnd:8329725122699607932|dvc:m|adp:1o1|bku:1#customer_reviews

Vs

http://www.tesco.com/direct/gt2-racer-office-chair-grey/666-2673.prd?pageLevel=&skuId=666-2673

What I don't get is why the tesco one and all racer type chairs cost so much, anyways thanks for the help !
 
Thanks I knew that you had to be sitting straight but never knew your eyes had to meet the screen whereas I look up, cause the TV screen is put up slighty on the wall so that might be the reason why I get a wore neck, I was contemplating whether to get a monitor within the same region as the chair but decided that the chair would be better for my health lol anyway I have a 42inch screen ! :D thanks for the help!
 
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