Lots of variance for how you can build.
Gear wise Lucent Echoes is my go to for pugs but Pearlescent Ward is also a solid choice. Crimson Oath is good if you don't have either or in pug dungeons to help hit pen cap(I've gotten a few trifectas running it so don't feel too bad even if it's not optimal). Saxheel Champion is also a good set to have in case you switch off Aggressive Warhorn for any reason
Champion point wise the only thing I ever slot in besides the main four is reinforced. The damage shield is helpful in some fights.
For skills I only switch out my ult really, usually swapping Aggressive Warhorn for Renewing Animation if I'm trying to prog and the group is struggling with certain mechanics hard. Can also but nice in the Night Market so people don't have to go back to wayshrine.
For traits you can swap divines for sturdy while learning or if ya gotta block a ton. Swapping infused on jewelry for harmony is also optimal BUT requires your group to provide consistent synergies. I just run infused for pugs.