The Outlaw Rogue tier set is simple yet effective.
The two set causes your Sinister Strike to hit a second time 15% more often
The four set makes it so whenever you press RTB one of your currently active buffs will be rolled into your next roll.
Overall, this season has a lot of very powerful trinkets.
From the raid, we have the Cataclysmic Signet Brand and the Coiled Serpent Idol. Both of which are simple passive trinkets.
Other than these 2, a lot of the remaining trinket options leave a lot to be desired. These trinkets are a tier below what is stated above, but Bandolier of Twisted Blades, Accelerating Sandglass, Or My’das Talisman are decent options.
In season there are 2 main special weapons you want to be chasing. One of the Nick of Time from the first half of Dawn of the Infinite, and the other one is the Thorncaller Claw from The Council of Dreams raid encounter. Both of these weapons are best in slot for both Single Target and AoE so the sooner you get them the sooner you can ignore your weapon slots in terms of upgrade potential.
Embellishments and Sparks
When it comes to using your sparks properly, the two highest priority things to grab are the Toxic Thorn Footwraps, and then a generic crafted item to put Toxified Armor Patch on. Good slots to put this on are Helmet, Cloak or Belt.
After that, you can just sim your character in droptimizer and craft the items in need of an upgrade the most. Items such as engineering bracers or a necklace are usually good crafts to grab after.