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Not sure tbh. One would hope it's one of those you get what you pay for things so I would just go to John Lewis and buy whatever it's on your range. The main thing is that it can put out huge amounts of scalding steam. I do know they always ducking scale up after a few years if I don't use De ionised water so don't spend too much.
https://www.johnlewis.com/john-lewis-partners-steam-generator-iron/p2116418 is probably fine
Get a fuck of steam generator iron that cranks out industrial amounts of steam and a decent ironing board and you'll get through the ironing pretty quick