I think I'd separate the requirements.
Giffgaff, Smarty and others would quite happily fulfil the requirements of a no-commitment dumpable general purpose sim. I'd prefer EE or O2 to Three as the underlying network in the UK, but that's down to personal experience of network coverage in more remote areas.
A dedicated data-only SIM is likely to be better value for mifi usage, but the best depends on usage pattern.
I'm currently using an EE 120GB/12 month preloaded data only SIM bought (and still available) from Argos for £50 in my mifi. The original 12 months has expired, but monthly add-ons aren't extortionate - I put 15GB on for £10 just before heading to the Continent (where I currently am). You can buy more, and the price per GB gets better the more you buy. I'm simply buying chunks when I want to use the mifi, and leaving it fallow in between (though, as with many Sims, it needs using or topping up at 6 monthly intervals to keep it alive)
Being Paygo, the terms and conditions seemed to imply that all of such purchase was also available for roaming, and so it seems - it has worked perfectly throughout France, Belgium, Luxembourg and Germany. On an EE contract, as opposed to Paygo, there are additional roaming conditions (thank you Brexit).
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