Horizon OC is a more modern and advanced sys-clk. It gives you more control and configs overclocking CPU, GPU and RAM. As well as voltage control (undervolting/overvolting), memory timing adjustments, and more advanced clock and power-management...
Give DBI a try with the latest version and the translation patch, what's to lose.
It has many features Sphaira doesnt, I use both for each's strengths.
I'd also suggest Themezer and NXThemes Installer for theming and Horizon OC instead of sys-clk.