[CentOS] centos 4.8 or centos 5.5 for server is great?

hi,i am new guy for linux world

i made a server (centos5.5  8g ram   300g*2 sas 15k  harddisc ),but some my
friend use linux feveral years advise me use centos 4.8,he said it is much
good than centos 5.5

it is trouble me ,is it newest is good than older?

please give me some advice

Thanks all
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