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Ok the freesync Alienware would be crazy good for £299. You only need 120fps minimum in my experience 240hz works well from 120 to 240. So this would mean you would be ok you should not worry as you can still play on high at 144fps on a 240hz freesync monitor.
The reason you want to go higher is input lag, Motion blur, Aliasing and most important of all blur vastly improve from 144hz to 240hz. You would be crazy to go 144hz when you could get the Alienware or Acer. 144hz would imo still pack some blur but 144fps on a 240hz panel has hardly any.
new? 140!?! wha?
Any clues
I own both the XG2402 and the AW2518HF and they are exceptional monitors. For what you paid for the XG2402 is a steal!