The gold standard for TV westerns is "Gunsmoke", "Bonanza", "Rawhide", and "The Big Valley".
That said....there is a slew of others that are fantastic as well....such as:
Have Gun Will Travel
Maverick
Tales of Wells Fargo
The Virginian
The Rifleman
Bat Masterson
Tombstone Territory
Laredo
High Chapperal
Wanted Dead or Alive
Zane Gray Theater
Wagon Train
"Gunsmoke" considered the best ever. I've watched every episode and it is such a good TV show, forget about western, I often watch re-runs and still enjoy them as much as when I watched the first time through. Jame Arness being the main reason why. His character Matt Dillon is amazing.
Trivia....Arness's son Rolf won the world surfing championship in Australia back in '70. His Dad, James, also surfed!
In 1970 Rolf Aurness* won the Surfing World Championship at Bells Beach and his father James Arness the Hollywood actor (he featured in the tv western drama 'Gunsmoke' as Marshall Matt Dillon) travelled with him to Victoria (Australia). The pair surfed at Bells in the lead up to the event. This footage from John Bennett's film Blue Cool shows James Arness surfing Bells on his Bing Foil.
*there's a story about why Rolf altered the spelling of his last name......