Warrior or cinderhulk rek sai?
Just bought him.
Just bought him.
*her
:3
I typically get warrior and then build full tank from there onwards
I have two general builds I "prefer" on Rek'sai depending on team compositions, the role I'm fulfilling, and how well I'm doing.
Keep in mind that the following build can and will be adjusted to suit the game. They are nice generic builds to start from, but shouldn't be adhered to religiously.
Build 1 (Damage):
or
or
,
or
,

I like this build for the early durability and waveclear that it provides. This build makes you quite difficult to kill early-game while providing a strong spike in damage for mid-game fights. While you don't deal much damage until you finish Titanic Hydra (and they made it quite a bit more expensive), it's build path provides some useful stats.
Obviously, you could switch the purchase order of Black Cleaver and Titanic Hydra if you want to prioritize the CDR and armor penetration over burst damage to squishy targets.
Build 2 (Damage/Durability):
or
or
,
or
,

If you want, I would recommend looking here to see how professional players are building her and here for a different interpretation.
While the metas differ (Rek'sai being more of a supportive jungler at higher levels), it should be a good starting place.
Should i get trackers knife or stalkers blade?
Tracker's Knife is useful for providing vision to track the enemy jungler and prevent ganks (in addition to warding the map late-game). Rek'sai can invade rather safely due to Tremor Sense and her tunnels, so you can easily ward the enemy jungle.
Stalker's Blade is useful for catching targets you want to knock-up and for escaping from dangerous situations.
Skirmisher's Sabre is useful for dueling enemy champions and for providing additional damage on a target.
it always depends
Cinderhulk forsure, go full tank with
and maybe a
and you will chunk
cinderhulk is almost always better, the tankiness lets her do what shes meant to do. black cleaver is also a must have on her. other than that just build according to the game
Her. Rek'Sai is a girl, treat her right.