It would be nice to have some advice from those that own an ultra 4k tv

I was thinking of getting an ultra 4k tv. All I want to do is play ultra 4k content and watch youtube. I have seen a couple of tv's I can get this one for around £400 Or, this for around £330 I've never actually owned a TV, so input would be very much appreciated. I currently only use an IPS monitor, but would it be worth waiting and getting an ultra 4k monitor? Or a relatively cheap tv? Input would be appreciated. Regards.
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