Hi Craig – funnily enough I have both helmets and have done many thousands of KM in each. My short answer is that I prefer the HJC for longer trips, touring and high speeds and the AGV for shorter trips or stop/starting and around town. The HJC is bigger and feels more like a normal full face lid. I’ve done big days and shorts days, track days and touring in both. I run a Cardo Packtalk in an Arai, but can’t see any dramas in wither of these, possibly more space in the HJC. Here is my AGV Sportmodular review I have been wearing it now for 5 years and it is as new – https://bikereview.com.au/product-review-agv-sportmodular-helmet-2/ and here is my HJC RPHA Carbon review I have been wearing it for 2 years and it is still perfect – https://bikereview.com.au/product-review-hjc-rpha-90s-carbon-modular-helmet/ and more questions let me know I have both lids here at the office and can check anything you need. Jeff.