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As mentioned try on as many as possible, I find Arai the best for my head shape but have used shoei and hjc with no issues. I've had flip up ones for work and actually got a cheap OP one now TBH unless you need to chat to people a lot I would not bother with one unless they're a real bargain. The internal dark visors are well worth getting though. At the risk of sounding like an old bugger, if you're new to biking when you get your helmet get ear plugs as well even for commuting.
Looking at buying my first helmet. What’s a good for a beginner and what should I avoid?