I'm interested in:
- Performance
- Latency
- Throughput
- Resource usage (CPU, memory, ...)
- High availability
- No single point of failure
- Features
- Transport options
- Routing options
- Stability
- Community
- Active development
- Widely used
- Helpful mailing list, forum, IRC channel, ...
- Ease of integration with my current codebase
- Gotchas maybe
- Any other thing you think I omitted
I've read about them, but I couldn't find a good comparison. Specially I'm interested in performance benchmarks comparing them. (Maybe I should do one on my own! I hope not.)