Ljubljana or Brasov for female solo travel?

Planning a 6 week trip through Europe this summer and deciding on where to stop between Prague and Split. I'm between Ljubljana and Brasov for a main purpose of seeing some mountains and doing some light/moderate hikes.

Ljubljana makes more sense logistically (it's on the way), plus Ive heard its better for tourists in terms of making friends. But Ive never been anywhere like Romania and Im super interested in the mountains, the iron curtain history, and the medieval castles. I'm less interested in what Ljubljana has to offer, but it seems like a better alternative for a mountain town as a solo female traveler.

My hesitations for Brasov are:
- Id have to fly in/out of Bucharest and take a bus or a train to Brasov, and Im not sure I can rely on the infrastructure. Plus theres minimal direct flights into Split.
- Ive heard the hostels in Brasov are mostly occupied by men on business trips or doing digital nomad stuff. I dont mind that, but I want to make friends my own age and I want to feel safe where Im staying.

Advice?