while YL has a bit of a edge on Peach, because of the things you listed, it is important to remember the tier list in times like this.
Peach, five.
Young Link... um... a lot lower.
Having just played one of the best Peach's in the world (Mike G) recently, I have a little thought on this match. YL -can- do well here, but Peach is still a **** incredible character when played exactly right. Float cancel **** on your shield is rough, cause YL can't shield grab her for ****. To add insult to injury, when Peach is floating right above the ground, the hookshot goes through her : (
You do outspam her which is nice. Bombs and Boomers lead to dair, uair, or tip nair kills at times. On the ground dsmash or ftilt are like your only kills besides the dreaded fsmash and those are all not too common against old Peachy.
Peach is just a better character, unfortunately. Face to face combat without projectiles, she wins. She will crouch cancel dsmash anything that isn't dair. She will Float cancel jab throw **** attack your shield, which is rough. Spot dodging becomes friggen impossible cause of her downsmash.
The only times you are really in a great position is when she is above you. She can't do much about uair. She will try to dodge around or up B or whatever, so just watch carefully and uair like a mad man. An obsessive mad man. wait wtf
Overall I would tell you on a standard, YL does beat Peach.
But when it comes to the highest potential, it's even, or if anything in Peach's favor just cause she's... Better >_<
... what am I saying, Young Link is the greatest!!!
hope this helped