THIS^^^^
Most folk are comfortable with certain lids because of the shape of their head but you won't know until you have tried a few on yer bonce.
I have an Arai shaped head. Last lid I had before my current one was an Arai RX7RR. Fitted perfectly. Current lid is an AGV Stealth Dragon which I'd put nearer a "Shoei" type fit ( tighter, narrower than an Arai ) but it fits me well. It's all seriously subjective and down to personal preference.
The only thing I'd say on the purchasing any lid is spend as much as you can possibly afford. This is for obvious reasons.