NixOS vs. Gentoo for a desktop system

This is more of a personal dilemma, since I keep finding myself switching back and forth between NixOS and Gentoo every now and then. I've done this twice for each so far ever since I immediately started off my Linux journey with Gentoo, making a quick stop at Arch once when I didn't have enough time to set either of them up properly. Both of them provides a massive amount of control over my system and lets me build my system in weird and interesting ways, e.g. musl, clang, and/or SELinux for Gentoo and impermanence for NixOS (it still kind of blows my mind right now). Personally, I find Gentoo more intuitive, but NixOS is more powerful for managing complex systems, but then again, I don't have any complex systems to manage, only a singular desktop system. I'd love to keep switching back and forth, but I feel like it has become sort of a time sink for me, somewhat hindering my studies, and thus I feel the need to decide which one to settle on, and which one to keep in a VM to mess around with. That brings me to the title of the post, which do you think is better for a simple desktop system? Also, I don't know how viable dual booting is, given that I manage my dotfiles almost entirely with home-manager, and I like to have secure boot.