What to look for in a floor steam cleaner?

[EffinIneffable]

Toddler is very keen on throwing food and we aren't very keen on scrubbing floors three times a day so want to get a steam cleaner to make life a bit easier. But there are so many - some are quite cheap (sub £50) and some are ££££ but I can't really see much difference in the descriptions? Which are good ones? What is important? Thanks!

Bump! I promise I'm not a spammer - genuinely looking for opinions (just seen there have been a lot of spammy posts here today).

The main difference between mine and my mum's, which is what she finds frustrating, is that hers emits continuous steam, while mine has a trigger. I think that's the biggest difference between some of the cheaper and pricier ones. Having a hose with a nozzle that can emit a fine jet of fast steam is useful for grotty nooks and crannies, around taps etc.

I have a cheap B&M job. Works fine,but is trigger powered and only holds about 100ml water which means turning off, refilling and heating 3 times to do the bathroom from top to toe inc entire floor and bath.

A also have a cheap steam mop, also great.

Thanks ladies, trigger and decent size water tank the only things to look out for then? How are some of them £150 plus then??!! Just better marketing?