Yes, Samsung B Dies are most likely to actually work at the advertised speed. I'd aim for 3200 MHz CL16.
X470 gets you:
-4 more USB 3.0 Gen1 Ports, which you probably don't care about.
-2 more SATA 3 Ports or 1 SATA Express Port, which you won't use unless you've got at least 3 SSDs.
-2 more PCIe 2.0 lanes which you definitely don't care about
-SLI support, which you shouldn't care about.
So B450 is fine. Just get a mobo with 4 RAM slots, 2 indicates that corners have been cut.
That's a bog standard 4+2 design, what makes it better than literally any other mobo? Sure, in exchange for having worse MOSFETs the use double on the high side, but that doesn't really improve anything.
I wouldn't be worried about not getting enough power and start worrying about getting garbage regulation quality because "budget" and "high quality chokes and capacitors" do not go well together.
Below 100$ the main thing is getting good airflow and a real because at the end of the day getting the heat away from the MOSFETs is way more important than some minor differences between all those 4 phase designs.
It's a good budget mobo but there's only so much you can do on a budget.