Ren is flexible and there's lots of good builds for him.
A rather good build for Ren might be;
Merc or CDR boot, Frozen Mallet, Black Cleaver, Warmogg's, Atma's, Force of Nature.
Another good build?
Sunfire cape/Frozen Mallet/Force of Nature/GA/Madred's.
A lot of items work very well on him.
Meta golems build works as well.
As far as Lee goes, there's a lot of builds that work as well.
A rather good build for Ren might be;
Merc or CDR boot, Frozen Mallet, Black Cleaver, Warmogg's, Atma's, Force of Nature.
Another good build?
Sunfire cape/Frozen Mallet/Force of Nature/GA/Madred's.
A lot of items work very well on him.
Meta golems build works as well.
As far as Lee goes, there's a lot of builds that work as well.

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They're good on Renekton (if you run 0/21/9), but not Lee Sin.
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"I contend we are both atheists, I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours." - Stephen F Roberts
For Lee, I'd say he's a bit more flexible when you talk about builds.
I would say that since you'll probably more aggressive than passive, for masteries, go 21/0/9 for jungle.
If you're jungling then yeah, smite and flash is the right way to go.
Most people get Wriggles on Lee sin but I wouldn't rush strait for it. Go for 2 or 3 doran blades to maximize your early game ganks and such.
As for items, it really depends on your style, you COULD do glass cannon, but I'd say that going Atmogs/Fratmas first then deciding is a better choice.
So like: Wriggle's / Merc Treads or Ninja tabi / Warmog's or Frozen Mallet / Atma's
then you'd either go with more damage with like: Hextech Gunblade or Tri-force or Bloodthirster / Last Whisper
or you'd build even tankier with: Force of Nature / Randuin's.
The Dodge rune thing:
If you plan on jungling you need something more reliable to mitigate damage, so you'd usually go armor seals. imo, i'd only get dodge runes if I speced in the dodge mastery in the defensive tree for the speed up, and i'd only pair them with ninja tabi if the other team doesn't have that much cc.
I would say that since you'll probably more aggressive than passive, for masteries, go 21/0/9 for jungle.
If you're jungling then yeah, smite and flash is the right way to go.
Most people get Wriggles on Lee sin but I wouldn't rush strait for it. Go for 2 or 3 doran blades to maximize your early game ganks and such.
As for items, it really depends on your style, you COULD do glass cannon, but I'd say that going Atmogs/Fratmas first then deciding is a better choice.
So like: Wriggle's / Merc Treads or Ninja tabi / Warmog's or Frozen Mallet / Atma's
then you'd either go with more damage with like: Hextech Gunblade or Tri-force or Bloodthirster / Last Whisper
or you'd build even tankier with: Force of Nature / Randuin's.
The Dodge rune thing:
If you plan on jungling you need something more reliable to mitigate damage, so you'd usually go armor seals. imo, i'd only get dodge runes if I speced in the dodge mastery in the defensive tree for the speed up, and i'd only pair them with ninja tabi if the other team doesn't have that much cc.
Either way it's a small difference.
If you're gonna run the 21 defense, might as well take dodge yellows.
If not, probly armor.
Wonder what Searz thinks.
If you're gonna run the 21 defense, might as well take dodge yellows.
If not, probly armor.
Wonder what Searz thinks.

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I think, searz said once, that dodge runes with
Nimbleness
are S-Rank, other than that A-Rank.
Armor is S-Rank.

Armor is S-Rank.

^To translate:
Dodge isn't worth it unless you have the mastery (or play on dominion since it might be better there).
Dodge isn't worth it unless you have the mastery (or play on dominion since it might be better there).
"You can't have your privacy violated if you don't know your privacy is violated." - Mike Rogers, U.S. Representative for Michigan's 8th congressional district, 2013
I.e: Mike Rogers doesn't think it's rape unless the victim knows (s)he has been raped. Sounds legit.
I.e: Mike Rogers doesn't think it's rape unless the victim knows (s)he has been raped. Sounds legit.
But if you have the mastery, then yes they are superior to armor at least mathematically?

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How can
And
And about runes, I usually use marks penetration, glyphs magic resist per level and quints or flat HP or armor penetration... And for seals, mana regen or flat armor... but i see many guides with dodge, but only 6.8% of dodge is good? They're efficient early and late? If I use them, isn't better using dodge quints too and getting ninja tabi to maximize it? but the tenacity? :/
I looked that graphs thing, but I can't see a big difference on them, only in the price... are dodge seals cost efficient?