The HTC U 11 scored the coveted Snapdragon 835 chipset - something lacking on the HTC U Ultra. HTC's new darling is among the earliest offerings with Qualcomm's top chip, though not the first. That means we have some interesting competition to test it against. The Xiaomi Mi 6 is another S835 phone, as is the Galaxy S8+. We also tested the S8+ with Samsung's own Exynos 8895 chipset. We also put the Mate 9 that uses Huawei's in-house Kirin 960 chipset as a reference. The other competitors (aside from the iPhone, obviously) came out with the older generation Qualcomm chip, the Snapdragon 820...
Source: http://www.gsmarena.com/htc_u_11_tested_benchmarking_the_snapdragon_835-news-25055.php