IMO both maple and walnut do both low and high well.
I particularly like the walnut at higher tunings. It has a great sound tuned high.
I also particularly like the 5" depth for lower tunings, no matter the wood. So walnut for both high and low tunings. (same as maple really, just a different personality/flavor)
Counter-intuitive since I thought of walnut as excelling more in the low tunings...which it does. I was pleasantly surprised at the personality the walnut shell took on at the higher tunings. It's got a little extra something something.
A solid walnut shell, 5" deep, is definitely a different sound than a solid maple shell of the same size.
More people play maple than walnut IMO. Meaning you won't sound like the maple crowd, not throwing shade at all. I love the sound of my solid maple snare
You know maple, but it doesn't sound like you have much experience with a walnut snare. Forgive me if I'm off there.
I would go walnut. No compromises, and maybe a little bit of an edge over maple.
I have solid shell drums made from maple, ash, walnut and padauk. Honestly, some days I prefer just one of those drums over all the others, but it's always changing. This week it's my walnut snare. Such a big sound tuned low. So I can't pick a favorite. I would settle for any one of them if I could only have one.
Maple is safe, and a known quantity. Worst case scenario, you don't like the walnut, in which case I betcha you could exchange it for the maple within 30 days of purchase...if your dealer has the 30 day return policy. Take the original heads off and play it with your favorite head. So if you return it, it doesn't look used.
Really looking forward to your choice. Either way you're golden.