The $63 N2+ has the latest "C" rev of the S922X, which is a dual 2.4GHz A73 + 4x A53 and a "MP6" variety of bifrost GPU, a G51. The C4 has the newer S9005X3, which has 4x 2GHz A55 cores and a smaller G31 bifrost gpu. Those A55's, while improved over the A53's, are going to be sigificantly outmatched by the A73 cores on the N2+.

The H2+ has an Intel J4115 Atom celeron running 2.3GHz all-core, which I expect would trounce these ARM chips. It's also $120.

Alas there hasn't been any update to the excellent Exynos5422 that started HardKernel's/Odroid's ascent as the XU4. Lovely 2GHz Cortex 4x A15 4x A7 with (2x! wow! thanks!) USB3 root hosts and on-package RAM: really an amazing chip way ahead of it's time. These days it's way outgunned but this chip really lead the way for SBCs with it's bigger cores for the time, USB3, and on-package RAM (which we really need to see a comeback on).

Worth noting that the A73 on the N2/N2+ and RPi4 are from ARM Artemis, which hails from 2016. Maybe some year SBC won't all be running half decade old architectures, but at least we're at the point where half a decade ago we were doing something right. ;) Still, one can't help but imagine what a wonder it would be if an chip & SBC were to launch with an ARM X1 chip available.