You're really going to need to evaluate each of the tools to see which will do what you need for the money you're willing to pay. 10 instances is a pretty small installation, so any of the tools can support you. All the best tools have a free trial period, so you can install them and test them out.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning