Triforce is better for Ezreal Right now
I really think tri force is better for ezreal mostly because of the benefits triforce will provide over iceborn in the late game. Iceborn is good if they have a low mobility comp which most people in contrary belief try to use in high mobility comps. When you have someone who is super high mobility which one seems more safe. Being able to burst with triforce or allowing the high mobility champ to still use their gap closers in a more drawn out fight. Now hitting your W and Q isnt hard if you time it right which is why ezreal is a challenge to play. In most cases Ezreal has better synergy with triforce because it allows him to focus multiple targets with more than decent dmg. If you die then thats alright because at least you did your job in the fight. You did the dmg that needed to be delt to win the trades and probably win the fight. Now I have only played two games but I can safely say that Triforce may be more expensive but it is definietly the better choice. That W and Q and triforce proc combo are deadly and intimidating. Not to mention a nasty ult that can finish them off or zone them for another W and Q triforce combo. IceBorn was good when poke was the meta but in this burt meta it seems like Triforce is the way to go. Also buy
and the charm as first items to get an easy tear with the sums being tp and flash.