I think batonning is a legit skill and has its place in bushcrafting. Many "experts" say otherwise. People never debate the benefits of splitting wood, especially in wet climates. Quartering logs make them burn better by exposing the dry core, and sharp corners catch flames better. People argue that batonning knives is stupid and to use a hatchet or axe instead. I agree, only if you have one you're willing to carry. I don't want to carry a 2 lb axe when I'm already carrying the rest of my camp on my back, plus a weeks worth of food. I'll opt instead to carry a slightly "heavier" knife instead (it's a couple ounces for a lot of capability, don't be a gram weenie). I've never broken a knife while batonning, and I've even tested them on nasty knotted logs. I find a knife much easier and safer to use most of the time too, especially for kindling.
A couple things to consider:
Your knife may be the single most important survival tool if you're knowledgeable and skilled enough to utilize it. Buy something of good quality and make sure it is sharp. A 4-5" blade is all you need to do most wood and hunting tasks.
Don't strike the handle, and make sure only the blade is touching the log, not the handle. If you're trying to baton logs too large and have the handle up against the log, you'll create a fulcrum and risk shearing the knife. Only use a wood baton. Never rocks. Try not to baton on top of rocks, or in to dirt. Any knife will chip and dull or break if used improperly.
A full tang knife, while heavier, is much more durable. If you're buying a knife with the intention of using it for batonning, get something full tang.
Not all grinds are created equal. A hollow grind and full flat grind will bind in wood much easier than scandi and convex grinds. I've used every grind I could try, and I think that convex grinds are superior in most applications.
Steel and heat treat matters. A lot. Super steels may be wasted in some regard, but I'd sooner take a blade made from CPM 3V from a reputable mfg and have confidence I'll never break it than some gerber mystery stainless steel.
My top choices in knives I would recommend to you. You won't go wrong with any of these:
Mora Garberg
Benchmade Leuku (3v)
If you have the money to invest, I think nothing beats Bark River knives. Hand finished convex grinds, top quality steel, and an unconditional lifetime sharpening and warranty. USA made with USA materials. They will fix or modify (or replace if necessary) any knife to your specs no questions or exceptions. Send it in and they will refinish the knife, literally as good as new. The performance is second to none and heirloom quality.