I am getting tired of seeing nothing but 10 man vs 25 man (Read: Paragon vs everyone else) and no I'm not a Euro fanboy I am in the US and I'm telling people it doesn't matter. 25 man fanboys are butthurt that 10 man guild is ahead and the 10 man fanboys are just feeding the trolls.
I'd also like to iterate that everyone on the forums that is arguing over who got world first does not belong in a top 5 raiding guild, and will never be in a top 5 raiding guild, and the competition in the top 5 raiding had no effect on your life (Ok, maybe some people are losing sleep over it, I'm certainly not)
TLDR: Some fights are harder on 10 man, some fights are harder on 25 man. Some fights are the same. Get over it.
TLDR(2): If you aren't in Paragon or Blood Legion, stfu