Two of the three names are unknown to me. This word of mouth delivery did nothing to make me interested in any of the three though. I have no idea what any of them actually do. I'll leave it as an exercise for the reader as how best to internet search "Henry".
>>dylan6+(OP)
All 3 are appliance manufacturers. Miele and Henry are predominantly vacuum cleaner brands.
Henry hoovers are ubiquitous in the professional market in the UK and well regarded for durability, performance and the cute face all their cleaners have. Essentially anyone in the UK will have used, or seen one be used