I think the NR200 is one of the best ITX cases there's been in a long time and generally speaking, it's a great entry point into the ITX world. It's relatively cheap, well-built and allows a good selection of hardware inside it, which lends itself to better cooling performance. It's 18L volume is considerably bigger than the likes of the 11L Dan A4 H20 but trade-offs are the nature of the beast in ITX builds. As an example, the Dan A4 H20, whilst smaller, uses a PCIe riser cable which isn't necessarily everyone's cup of tea.
I prefer air cooling as well and currently have an NH-U12A in my NR200P. But I've also had a NH-D12L and NH-C14S in previous builds too. And all have performed very well.
What CPU were you intending to use with your build? The 4070 wouldn't be of concern but if you're putting in a power hungry CPU, then the capacity for a beefier heatsink might take priority in which case you go for. I personally try to stick to 65W variants of the CPU (i5-13500, currently) but I don't overclock and don't need bleeding edge performance for anything.