what is the difference in display resolution
SXGA is an abbreviation for Super Extended Graphics Array referring to a standard monitor resolution of 1280x1024 pixels. This display resolution is the next step above the XGA resolution that IBM developed in 1990. The 1280x1024 resolution is not the standard 4:3 aspect ratio, but 5:4 (1.25:1 instead of 1.333:1).
UWQHD (Ultra-Wide Quad HD) is a display resolution of 3440x1440 pixels in a 21:9 aspect ratio. The first monitor to support this resolution was the 34UM95-P by LG Electronics, which also first coined the term UWQHD.