Because i have quite bum knees with my right one being a complete hobo living under a bridge.

I am quite okay squatting and running, but i fear going for impact inducing moves like drop kata guruma or shoots lets say.

which of the 2 is easier on knees overall ?

Ideally, your knee shouldn't smack the ground when you shoot. Maybe brush it. So, wrestling I guess? I don't do drop-anything in Judo anyways, it's kind of a personal choice.

Well, the nice thing about Judo is that you're not exactly required to do every throw. You can develop a set of "go-to" throws.

from my experience wrestling is harder on the knees, at 23 I already have arthritis in my right, and had it before i started Judo about a year ago, and nothing i've done in Judo has the same impact on my knees as a shot.

People, you can buy knee pads for less then $15

Amazon.com: Mueller Knee Pads- Black: Sports & Outdoors (http://www.amazon.com/gp/product/B000USCUPA)

It's not that hard

****.My knees are shot and I'm only 18.I can feel I'm slowing down, and I can't kick the way I used to.I think its time to visit a doctor.

I have found with judo if someone poorly executes a throw on you and can be quite harmful to your knees. Stuff like Osoto Gari with the reap right across the knee can do some damage, also stuff like tae otoshi (sic) look to be quit dangerous. Although in a good gym with good training partners I don't see it as being a massive issue.

I have bad knees (bone fragments removed from one and the other one was shattered in a car accident) and judo doesn't bother mine at all. I'm a former wrestler and it does hurt when I shoot so I focus on mostly Greco style takedowns (like Randy Couture) or if I am going to shoot I usually try to stay away from double legs or high crotches because they are straight on and hit the knees pretty hard. Sweeping shots like an outside single don't seem to bother me personally.

In either judo or wrestling there are going to be tons of moves that don't bother your knees so just focus on those and develop your game around them as was stated earlier. In bjj I can't close my guard on most guys because I have short legs so I play open guard. There's almost always ways to work around your physical limitations.

Because i have quite bum knees with my right one being a complete hobo living under a bridge.

I am quite okay squatting and running, but i fear going for impact inducing moves like drop kata guruma

the way I was taught to do drop kata garuma you don't land on your knees at all, drop seio nage however...

Still, in judo i was also taught to pick a small handful of throws and be proficient in them rather than trying to be a jack of all trades so anything that hurts your knees you can just avoid..

that being said I am currently out on injury to my knee and ankle due to a dodgy sweep but apparently i'll be back in another week or so (already been out for two) so its all good. I would definitely advise wearing knee supports and ankle supports BEFORE you get injured though if you have a pre-existing problem. i'll definitely be strapping my leg up when i go back regardless of how good it feels

you're going to tweak your knees in both.

as a wrestler, my knees are fucked. i wouldn't do it if you're looking to protect them.

Responding to judo throws can be a bit hard on the knees too, I've found. It's pretty common to fall forward on to your knees to stop going over on your back.

Knee pads are great, even if you don't do drop throws.

Get taught how to strap your knees correctly and be smart with your movements.

You will never be able to remove the danger of injury but you can reduce your risk.