I’ve only tried structirizr briefly, but I found it too inflexible. No way to draw concepts that aren’t strictly part of C4. For example I wanted to encapsulate 2 components in a box to represent that they’re currently deployed as one service (not necessarily a good thing to do in absolute but would have helped my team to grok it better): impossible.

I do like the idea of describing architecture formally, but the lack of customizability of diagram output was too painful