[mst]

Mojolicious is more tightly integrated, and yet if anything -less- opinionated about how you structure your controllers etc.

Plus it's focused on adding cutting edge features and cleaning cruft out the codebase regularly, which means it tends to be shinier but less backwards compatible.

"better" is relative; if you want to be able to pick up an app you last worked on three years ago and upgrade its dependencies under it and expect everything to still work, you'll do better with Catalyst. If you want to be able to write code to elegantly support the sort of push-based async code that wasn't really even a thing three years ago, you'll do better with Mojolicious.

For everything else ... it mostly depends on if you need the wider ecosystem and full-Moose-OO that Catalyst offers, which I consider pretty much necessary for large scale projects ... but if don't already understand why you want that, I'd say either is a pretty good choice.