PSA: Master Yi is a better split pusher than Tryndamere right now

10 reasons:

1. he obliterates tanks faster than anyone in the game, bar none. You can kill a full tank malphite (randuins, frozen heart, guardians, tabi, w/e else) in about 6 seconds. Tryndamere takes ages to kill something that tanky if he can do it at all (malphite and nasus give him issues).
2. he takes turrets faster. you can't crit a tower, but you can double strike it.
3. his early game is so underrated you can actually cheese people who don't expect wuju damage if you lane master yi
4. master yi cannot be kited, but tryndamere can be
5. it used to be that the reason Tryndamere was still king of the split push was because his ultimate has irreplaceable value, but by stacking tabi, phantom dancer and deaths dance, your durability vs most people in a 1v1 is high enough as master yi to displace the value of Tryndamre's ultimate, when you take into account master yi's other strengths.
6. there is plainly no way to itemize against master yi. you cannot slow his attack speed, and you cannot reduce the on hit true damage (which can be upwards of 150 per hit at end game, with effectively 5 hits per second)
7. he is a lot better in a team fight than tryndamere is because he's not as predictable, so if you do have to put the split on pause, master yi is much more of an asset than tryndamere is
8. combining all of the above points, and typically master yi will kill more people on a suicide dive before he dies than tryndamere will-- it comes down the the damage reduction from his items, avoiding damage and cc with alpha strike, cancelling burst with meditate and just doing around two to four times more damage than tryndamere, depending on how tanky the target is-- all that combined with ability resets. In other words, 2v1 or 3v1 against Trynd is probably less scary than 2v1 or 3v1 against master yi, because master yi will almost certainly kill someone before dying but Tryndamere might not.
9. if tryndamere wants to group fight he pretty much has to dive the back line because his kit doesn't give him the tools to do substantial damage to the front line, assuming they build the items they ought to build vs him. Master yi has better target selection because he can easily kill any front liner, even an ulted alistar.
10. basically the item system is more usable to master yi than it is to tryndamere; he scales better and becomes scarier as a split pusher