Nexus 5X
Used by 5 peoplestore.google.com ↗

“My phone is an old Nexus 5X, which is almost unusable with today's apps, either because of storage size (16 GB is NOT enough anymore) or performance.”
Nikita Prokopov Interview, Software developer · via Uses This 
“For Android stuff I'm usually testing on a Nexus 5X.”
Haley Rose Smith Interview, Android engineer, tech lead (Slack) · via Uses This