It just depends on what you're after. rofi is faster as an application launcher and I'm sure I could script my way into doing other things with it as well, but I'm willing to sacrifice a bit of speed for the convenience of extensions being easy to install and configure. In most cases it's a matter of browsing them (https://ext.ulauncher.io/), copy-pasting a GitHub link, and configuring a trigger. Sometimes there's also some system-level package I need to install and/or an API key I need to enter.

In any case, alternative launchers always beat the hell out of default ones. Once you get into them you're going to be reaching for a mouse/touchpad far less frequently and do a whole lot more with them than just launching apps.