Rugby league is pretty reckless but there’s no head collision and a rule against high tackles.

Rugby Union is a lot stricter with tackle technique and head injury - they’re trialling collision recorders, where if a player is recorded colliding too hard, they’re automatically sent off for a head check. It’s come leaps and bounds recently. The 90’s and early 2000’s were a terrible time to be a professional rugby player.

I guess that’s the other thing though - rugby’s non stop nature means a lot more total collisions per game, and therefore per career. With science coming out emphasising the role of ‘sub-concussive’ hits in CTE, who knows what’s in store for this generation of players, especially considering their increased size and speed compared to pre super professionalism.