33 05 35" tyrus sts ? Let me know your thoughts ?

[1965LONEWOLF]

Have an o4. 5 with a automatic transmission, with 4:10 gears , i run a 35" tires ( terra graplers ) 50% worn and i always end up in the top 6 trucks but want to finish better, thinking about buying the tire that the top 4 guys are running , ( duramax deisels ) and they all run a 33" sts tyrus tire. Should i go 33 or 35 inch and whats the pro's and con's of each ? Not hurting for power , i pull in 4 low in drive and shut the over drive off