Slightly? Really now? Slightly? Pls, do the math. Let's say you have IE/tri-force by level 12. Your bas AD is 87. let's say no ad runes and 8 ad from masteries. Let's say you start longsword and 3 pots. By then, Longsword is made a vampiric scepter in the IE build path and a phage in the tri-force path. With the IE you have at lvl12 87+10+8+80=185 AD. in the tri-force build you have 87+30+8=125 AD. that is 60 AD difference. Also, the IE build has 8% lifesteal. Now, let's see what stats you get in each occasion. With the IE, you have 185 AD, 100% crit, 40 AS from statikk and 2.25AD crit damage. With the tri-force you get 125 AD, 70% AS, 60% crit chance, more MS, more HP and 1.8AD crit damage. Now, with IE each AA will do 185*2.25=416.25 damage. with the tri-force each AA will do 225 damage on crit and 125 on simple hit. Your Spellblade will do a 174 worth of damage whenever you proc it. if you crit you get 225+174=399 damage and 125+174=299 with a non crit hit. In both cases, IE path comes out Ahead and also you have lifesteal with IE. Later in the game, i will also get botrk and you have to go for IE. that means, chances are, i will make botr much earlier than you will make IE and then i will do even more damage and you will also have more HP for me to abuse with my botrk. also, with botrk and boots i have 40+40+25=105% AS while the triforce and boots will be 40+25+30=95% AS (Statikk shiv AS incuded). So, even when you get the IE i will do more damage, i will do it faster and i will have the sustain that you with the tri-force will lack. Also, since it's not a 1v1 game, both our teams will have tanks, and with the juggernauts now, those tanks will likely be strong. You will have to deal with them quickly. So what do you do? i will abuse my botrk and shred them.
Also, you said that triforce is the best way to go to cap that crit without having crit in runes. Well, i was the kind of guy that didn't want to put crit in runes for the 100%. You wanna know what i did? i went for Youmus instead. What's better about it? It has a good active, it has the same AD value AND it gives you 20 armor pen. My rune setup with youmus build was 12 pen, 14 AD @lvl18 and the defensive stats depending the matchup. What i had late game was
,
,
,
,
and
. That gave me 400 AD, 32 flat armor pen and 39% armor pen and 100% crit. You know what that means? I did true damage to the squishy's and i decimated every tank with my ult pen and lw. Also i had a nice active to chase people and boost my AS even more. But the reason i changed it was the botrk i don't have as much armor pen but the damage vs tanks with the passive and the permanent AS boost plus that active is a lot stronger. So, to compensate i reduced my rune flat pen to 5 and put in 10% crit in the rest of my marks and Quints and kept me defences intact. What i get now depends on the game.
I will either go full ham and get the same build as above but with
instead, or i will ditch the bt for a defensive item. both cases, i will delete anyone in my path. It was that mirrored yasuo that owned me in lane earlier but i got the time to farm and got fed by the rest of his team. He went for defensive items, i think a GA and a tri-force as well... I killed him in 1 Q, Ult and one AA. he had the wave pushed so i Q on a minion then E to get to him and EQ->R->AA dead. he took the hit from a fully stacked E, and the shiv. All the HP from Tri-force and his other defensive HP turned against him and i built full ham. he died like a fly, he couldn't even hit me once. That's the kind of damage you get with the IE-Botrk path. and the GA was poped by me in the last teamfight, my ADC took the kill tho. Tri-force is not very effective compared to other items on yasuo. it is better on other champions like Yi that can utilize it better.