have used al three types, so all I'll do is put down personal experience, thoughts.
Open face... the best for peripheral vision, and really for hearing engines behind you etc. Downside? Little facial protection, even with a fitted screen like some now have. The other downside? I found out too late, is the level of wind noise without earplugs.. I now have 'industrial level deafness' of the type found on people who worked around heavy plant/machinery. Other 'con' is no facial protection in rain, sleet, hail etc without a screen, or one of the new style 'matt black n well 'ard brigade' scary neoprene face masks!
full face.....overall the best protection you can get,, bearing in mind checking SHARP/SNELL ratings, you get what you pay for. Biggest issues in my experience is the cheaper brands tend to use one shell size to make all internal head fittings, so either very difficult to get on and off as the opening at the bottom is too small, or floppy as it's too large, can mean an excess of padding to puff out the inside, rather than a different Styrofoam inner shell. Often cheaper and 'basic' internal impact absorbing shell is inferior. Straps/fixings/clasps can also be a bit suspect. Downside is enclosed, can be difficult to find a good fit for chin, mouth, nose etc.
Flip Front? SHARP will tell you which ones are good, like em or loathe em, Nolan consistently have a 100% 'non failure' rate of the locking mechanism. I think the top (Justissimo) Carberg had only a 70% non failure rate. The advantage of a flip front is the ability to talk, drink etc without removal, and for me also the critical reason for using them... can be opened in commuter or city traffic, giving excellent peripheral vision, and hearing. Downside is, the cheaper ones do have a higher 'failure rate of the lock mechanism....and they tend to have higher wind noise levels than a full face in general.
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