Both good, but I liked "They Call Me Trinity" a little more.
I've always been a big John Wayne fan and "True Grit" is my favorite Wayne movie but "Chisum", "Big Jake" and "The Cowboys" to name a few, are also among my favorites. "The Good, The Bad and The Ugly" is an all time great one, up there with "A Fistful of Dollars" and "Hang 'Em High". The Eastwood westerns are the best.
Slightly newer favorites...
"Silverado", "Tombstone" and "Maverick".