Did they say how much it would be to purchase it from them? If not that much of a difference, then it may be easier to go with them so you can try it on first.
It's also good to try a helmet on before buying to check for fitment. Even checking fitment if you plan to wear glasses (prescription or shades). I used to wear contacts a lot, but now just use my glasses. I tried my helmet on with my glasses and it doesn't quit fit correctly. My helmet aged out in 2020 anyway, so next helmet purchase I'll be trying helmets with my glasses on.