Are You Thinking of Buying a PS4 (Slim/Pro) or an Xbox One (Slim/X)?
The current gen gaming consoles are 6 years old now and by 2020 chances are highly likely SONY and Microsoft will release their next gen consoles, as history would indicate.
That said, if you're going to spend £300-400 on a PlayStation/Xbox then you may as well wait a little longer as they're nearing the end of their life cycle (I mean, they'll be supported for another 4-5yrs before they completely die from online support and new games).
And what about the Switch? That's entirely different, in its own league, I'd say.
Buy the new Switch with the improved battery rather than the "Lite" one (that's more for kids and you can't connect it to the TV and thus some aren't gonna work).
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