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Tacx Flow smart is probably the one to recommend. Not a bad time to be buying one second hand due to people unloading them on ebay/facebook for summer/post lockdown.
The biggest difference with a 'smart' trainer is that it can control the resistance.
So if you wanted an interval session, you just load one up, and it will make you hit those intervals, rather than you increasing the resistance, or pedalling harder, or trying to hit a higher heart rate.
Also if you want to be cycling at a 'fat burning zone' while watching youtube or something, then set the resistance at certain watts, and you'll hit your workout even if your cadence fluctuates.And compliance to a plan becomes easier when you have something more engaging than just a timer and heart rate number.
I went for a totally different option. Elite Arion Mag rollers (£100 from ebay). Although I now also have a Saris H3 (which I love), the rollers would always be my choice for a quick spin to burn some calories.