Texas is almost four times the size of Oklahoma. Moreover, Texas is the second largest state in the US.
Texas - over 30 million Oklahoma - over 4 million
Texas - Austin Oklahoma - Oklahoma city
Texas - Houston Oklahoma - Oklahoma city
Texas - Guadalupe Peak (8,751 ft/2,667 meters) Oklahoma - Black Mesa (4,973 ft/1,516 meters)
Texas - Big Bend National Park, Austin, Houston, San Antonio, Dallas, etc. Oklahoma - Oklahoma City, Tulsa, Wichita Mountains Wildlife Refuge, Beavers Bend Resort Park, etc.