Android One's initial lineup was pretty obscure - low-end phones from brands you haven't heard of. But a couple of recent phones are filling the gap left by the discontinued Nexus line, namely affordable but capable phones with software controlled by Google. We just finished reviewing the Xiaomi Mi A1 and we came away impressed. For around 250 give or take you can have a 5.5" 1080p screen, dual 12MP camera and long battery life (S625 chipset + 3,080mAh battery, 80h Endurance). You can get a similar Redmi phone with MIUI for a bit less but Xiaomi's software is a "love it or hate it"...
Source: https://www.gsmarena.com/weekly_poll_can_android_one-news-27709.php