The HTC One S9 is an upper mid-range phone and not on the same level as flagship devices. This is evident by the year-old design, but also by the fact that the S9 sports a MediaTek Helio X10 system chip, 2 GB of RAM, 16 GB of storage, 13-megapixel main camera with optical image stabilization and an additional ultrapixel unit for selfies. See the page for all specs.
Source: HTC One S9 specs