Marriott is holding tryouts for Apple’s Siri and Amazon’s Alexa digital assistants to see which would be best to provide voice controls for their rooms, Bloomberg reports. Marriott is testing devices from both companies at its Aloft hotel in Boston, putting them through their paces with tasks like turning the lights on, changing room temperature, closing the curtains and changing TV channels. The Wynn resort in Las Vegas added Alexa-equipped…