I agree with knarfeng's reply generally.
Schrade is not what they used to be. I have purchased more than a few of the older Taylor and current Battenfeld Shrades and have had mixed results
The overall construction, walk and talk, fit and finish I would consider to be good. The main concern I have is the blades. I have had some that were ground way too thick behind the edge, and they didn't cut worth a hoot despite the apex being sharp enough to pop hairs off your arm. Some newer Battenfeld knives have a hollow grind and are much better in this regard. I have had some with blades that will NOT get sharp... period. I don't really have an issue with 7cr17 (440A) as long as the heat treat is good. In my experience the heat treat on these are inconsistent. I have even had a couple of multibladed knives where one blade would be good and another would be absolute garbage on the same knife. For an inexpensive beater knife they may be worth a try depending on how much you expect from your knives. May get a turd, and may get a decent beater knife, but if you can catch them on sale somewhere they are generally very inexpensive.
Case knives are way better, and where I feel that they shine is in their spring tension, handle materials, and blade steel. Every Case I have owned has excellent spring tension. they have a good pull and just enough spring tension to make the knife feel solid when open, but I have never gotten a nail breaker from Case (or Schrade for that matter) Any knife that I fold my thumbnails backwards trying to open and have a sore thumb after using them throughout the day is a pet peeve of mine. (looking at you GEC and A. Wright

) However I equally dislike a knife that feels like the spring tension is too easy, that doesn't want to snap shut or stay open and feels just slightly better than a friction folder. Case knives have good steel (CV, 1095, and Trusharp) and they all take a screaming sharp edge and stay sharp for a reasonable amount of use. I love the hollow grinds on most of their knives, thin behind the edge and they are amazing cutters. The sharpness from the factory usually sucks, they come with a really coarse edge and burrs all over like they were sharpened on a brick. Usually after a touch up on a smooth stone and deburring they are good after that.
Buck knives are good, I own several 303's that are all really good, I did get one that was awful and I had to return. (had large gaps in the back, blades were hanging on each other making it difficult to open) This was the only example from them that I have seen like this over the years. I also own a 301 that I love other than the fact that I feel it has too light of a spring tension. I absolute love the blades, steel and grind on Buck knives. They are the some of the sharpest knives out of the box in my opinion and cut like a dream. Even the Chinese made Bucks are decent knives in my experience, but the US made ones are of a noticeably better quality and are more desirable. I would recommend the Chinese made Bucks before the Schrade offerings at a similar price point.
Anyway, these are just some of my observations after owning multiples of the brands you have mentioned. Maybe this will be helpful to someone.