My question would be why?
They get sweaty, in summer they get very sweaty. That sweat will encourage your glasses to fog (assuming you don't wear mesh) and can cause pressure headaches.
They can get hot and quite uncomfortable, they also can act as nice little targets behind trees, hedges, bramble patches etc. that are hard to conceal and make you an easier to spot target. Unless you make them look great (and each style that is something different) then they can be pretty dorky/brand new airsofter look.
They aren't generally rated, so while anecdotally they help in a tumble, walk into a branch, bashing heads on windows while climbing through, they can also cause these by adding an extra inch or so to your height.
If your answer is you want to wear nods or you think they look cool or you want that extra security they bring, want to mount a face mask, all are valid but the recommendation of what is likely to change.
The PTS flux is brilliant, owned one before and sold (regret it), have a genuine ops core carbon at the moment but just picked up another pts flux as they very good for the money. They can suit big heads 60cm plus, so if you're smaller, then they can look a bit spaceballs helmet esque (google if you're too young to get it). They are nice and rigid so do the protection thing well, they look cool, don't need a lot of dressing up to look good. But there is little to no ventilation, smaller headed players look silly, they aren't cheap and accessories (ear attachments, covers etc) are harder to source and more expensive.
Real opscore carbon/bump. They're super comfortable, light, ventilated, rated for bumps, knocks etc, come in a variety of sizes to suit. but they are expensive, £150 plus second hand if you're lucky for an old bump, £350 plus for carbon. New prices are silly (£600+). Legit accessories then add on as well (cost wise)
FMA do a good set of clones, they come in multiple sizes and colours. Haven't owned one so can't comment anymore but heard good things, if the cheap mtek flux didn't just come up then I'd probably have got one. I think getting a UK source isn't easy.
I have owned Emerson and dragon red(no longer exist), if you have a larger head, then they'll be tight.
Anything cheaper than £50 and I'd probably avoid to be honest.