Ducommun (NYSE:DCO – Get Free Report) and TAT Technologies (NASDAQ:TATT – Get Free Report) are both small-cap aerospace companies, but which is the superior investment? Get Ducommun alerts:Net Margins Return on Equity Return on Assets Ducommun -4.29% 7.70% 4.53% TAT Technologies 9.08% 11.10% 8.12%Institutional & Insider Ownership92.2% of Ducommun shares are held by institutional investors. Comparatively, TAT Technologies has a beta of 0.89, meaning that its share price is 11% less volatile than the S&P 500. The company provides MRO services for heat transfer components, as well as for manufacturing heat transfer solutions; and aviation components. The company was formerly known as Galagraph Ltd. and changed its name to TAT Technologies Ltd. in May 1992.