Better Buy: ASML vs. Aehr Test Systems

ASML (NASDAQ: ASML) and Aehr Test Systems (NASDAQ: AEHR) represent two very different ways to invest in the booming semiconductor sector. ASML is the world's largest producer of lithography systems, which are used to etch circuit patterns onto silicon wafers. It's also the only producer of high-end extreme ultraviolet (EUV) lithography systems, which are used to manufacture the world's most intricate, transistor-dense chips.