Engineered Arts Ameca vs Realbotix Aria
Verdict
Two humanoids built for interacting with people rather than for physical work. Ameca from Britain's Engineered Arts (187 cm, 62 kg, 61 degrees of freedom) is famous for its extraordinarily expressive face and is the flagship platform for interaction research; Realbotix's Aria (175 cm, 54 kg) is on sale as a social and service robot. Facts vs hype: both excel at interaction and expression, not at locomotion or carrying loads.
Spec comparison
When to choose which
Ameca
Pick Ameca if you need the most expressive platform available for research into human interaction.
Aria
Pick Aria if you are looking for a social and service humanoid you can actually buy.