I'm not a boot guru, so take my $0.02 with a grain of salt. I've been using boot for smaller and experimental projects because by default it feels so much lean

I'm not a boot guru, so take my $0.02 with a grain of salt. I've been using boot for smaller and experimental projects because by default it feels so much leaner then leiningen does, however, because the support tooling around leiningen is still so further advanced, for project we're putting into production here, those are still all lein based. The other thing I'd say is, I've found what tool lein vs boot gets minimized over time as the project evolves. In general, I do think it's gaining traction and its a great project!