Originally Posted by
Dragon9870
I feel like those trinkets are wrong, but it depends on your playstyle.
ToES trinket (forgot the name, too lazy to check; the one with passive Int and Haste procc) is amazing for your non-combustion rotations, but isn't going to do too much for you during Combustion time, while Relic of Yu'lon/Light of the Cosmos will give you a ton of Int, giving you a bigger Pyroblast which gives you a bigger Ignite which gives you a bigger Combustion.
I also value Crit higher than I do Int when gemming, but in no way would I rank Int procc trinkets lower than Haste procc trinkets, even with testing (especially as Fire, it's hard to test/sim stuff, due to the sporatic, RNG, nature of the specc). Haste will just give us a few combustion ticks or if lucky, another Pyroblast tick, and let us cast faster (which is why it's great for the "normal" rotation because we're just spamming Fireball and using Pyroblast when we get HU/HS), but for the "Combustion rotation", Int is going to dominate because of how Combustion dips into Ignite and Pyroblast (soon to be ONLY Ignite).