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Pretty much all the same. Old tech, hundreds of makers. Conti if you like splurging, CST/Decathlon/Halfrauds are usually cheap and cheerful, Schwalbe are good but avoid the ultralight ones unless you like wasting money and time.
New TPU ones are good as an emergency spare (25g vs 110g) but lose air quicker.
Also, top tip, buy a spare to keep inside the frame. More than once I’ve heard a Brompton owner complain they tried to get a puncture repaired and the local shops didn’t have 16” tubes.
Do people have a recommended inner tube? I have a slow puncture to get fixed at the same time I change tires. Thanks!