Oddly enough, I was recently browsing options for non-smart cellular phones, on behalf of an elderly parent who struggles to use and understand modern "glass slab" UI/UX.
It's slim pickings indeed. Kyocera, Nokia, and TCL were the brands I saw most often. Their products were all completely indistinguishable—tech specs were the same except for the the most minor deviations. it makes me wonder if they're all using the same commodity, off-the-shelf logic boards at this point and just differentiating with case shapes and colors. There were some interesting hardened options, like extreme impact or water resistance. Good for using at the job site if you were, say, an especially clumsy construction worker prone to falling in giant muddy holes.
An of course, there are the senior-oriented options like the JitterBug, which (still) aren't technologically any different, but tend to promote concierge-style customer service, easy to understand service plans, and hyper-simplified custom interfaces.
So yeah, what Paladin said: In my experience, as a resident of the U.S., if that's the kind of phone you want, I see no reason to do anything beyond buying whatever is cheap and looks good. It's likely to work identically to everything else in that forgotten and dying product group. No idea if the situation is different somewhere like Europe or the developing world.
EDIT: Grammar, and also to note that due to my goals, I wasn't considering enthusiast or boutique devices like Punkt, etc.