What project management systems do you use and why?

Again the question arose with the choice of a project management system. We are currently using @task .

Pretty powerful system, but not as good as we would like.

Not satisfied (by priority):
- high cost (30 bucks / month for one user);
- there are no context task branches that are activated under the conditions “if conv. executed, then we work on this branch);
- usability (pretty messy interface);
- there really is no project financial management system;
- slow work.

Like:
- project templates
- gantt (really buggy)
- great flexibility in presenting data (filters, views, reports)

Hence the question, who uses what and what can advise?