Well I think the kennel is the way to go too. But if cost is a factor than I would think a chain would be just fine too.

Ny coyotedawgs said that dogs can climb out of kennal runs to easy

Well I dont know very many dogs that can climb straight up 6ft unless they are part cat. I have had them learn how to open the door on a kennel before, they just flip up the latch and are free. But there are very very few dogs that can climb the kennal wall I think there are a few that get on top of there dog house and jump over the wall but very few can or will do that.

But if you are looking at it safty wise either one has its disadvantages, chains can and do choke and kill dogs but I know of some cases where the pup got its leg through the chain link fence and either died or had get its leg amputated.

One other thing if you have them in a kennel there is less chance of someone getting bit. Even if your dog is not a bitter if it is behind a fence there is alot less chance of something like that happening then if it was on a chain. I dont know if you live in town or not but if you do I am sure that that sort of thing could very well come into play with a kid coming into the yard and if a dog is on a chain that kid might not know the limit of the dogs range but if it is in a kennel the dogs range is always behind the fence