Bitcoin xt centralizes bitcoin since it makes it very expensive to run a full node, and eliminates miners fees therefore as block halves so does the security.
Also Bitcoin Xt seems to cripple tor nodes, and has a list of banned ip addresses, essentially a from of censorship.
In the bitcoin world decentralization is your friend and goes with the spirit of Satoshi.
Lets stay with bitcoin core, the reckless approach taken by bitcoin xt is causing the price to collapse.
To put it simply, if we do not increase the block size it will be more expensive and less people will be able to use it, that is to transact on the main chain directly, and instead we will be "forced" to us 3rd party payment processors. If you ask me I would like to continue using bitcoin directly and have the same level of transparency and security as the clearing houses.
However if we increase the block size then it will be less expensive and more people will be able to use it. I do think that increasing the block size is the most decentralized option. Even if full nodes will only be able to be hosted on powerful computers. I am a miner myself and I do not think that this will effect decentralization of mining because pools are a lot like representative democracy the difference being is that I can switch my miners over to another pool within seconds. It is the miners that decide not the pool operators, the pools serve the miners.
I do suggest that everyone reads Mike Hearn's article on why we should fork. Everyone should remember that this is not a popularity contest it does not matter who you like more or what you think of these people what matters is what is in the code itself. This is a crossroads in history and I hope that we collectively will make the right decision. So think carefully and please be rational and apply reason and decide for your self what kind of a Bitcoin you want.
https://medium.com/@octskyward/why-is-bitcoin-forking-d647312d22c1