65/35, Link can keep Sheik away for a while and give her damage, Zair with Bomb in hand is always a safe option, Zair is prety fast and if we conect at least one hit, we can throw the bomb -> quick dash attack (this is a safe option) and do a SH Fair or Utilt or Usmash depending on the damage of Sheik.
We are slow, have bad recovery and fast faller, so she can gimp us, defet us in close combat and look us with Ftilt, but with good DI we can get out, at least recive 30% of damage and no 50% (having a bomb will help you o get ot erlier, so that is why is good do Zair with bomb)
Sheik have bad recovery, isnt so strong, have low resistance, have only one proyectile against our 3 and Zair. i dont know if she have good Momentum cancel
any way, Link also can gimp sheik, Nair or Bair (sometimes Fair) are good options agains her. also remember her theter recovery, so Bair is a good move to Stage spike her.
We can live for too longer than she, our DI and MC are simply better, specialy the vertical, and her USmash and Uair are good and safe kill moves, so she will be troubles to kill us.
Many Links dont use one of the adventajes of Link, his range, our Sword are long, so we dont need stay too close of her to attack her, and this help us to switch rapidly to Spam mode XD.
keep in mind the Sheik projectiles, she can charge it and gimp us with those weapons, and on Stage she will never use it for attack, she will wait until we throw a bomb or our boomerang to stop it and attack
my ratio65/35