Two investment trusts that I'm considering with a record of strong returns for investors. : Investment trusts are one of the best instruments to help build your wealth. Even though trusts might be more expensive than index-tracking funds, they’re run by skilled managers, whose job it is to try to outperform the market. Fidelity Special Values (LSE: FSV) is one such example. This trust is one of the market’s best performers. Since the beginning of the year, the shares have returned 24% excluding dividends.