Cryo3Chrono3Enchanter2 is good if you emphasize support > DPS. Chrono3 is better in ET, tbh Thauma3’s attack buff is overkill unless your team DPS are mostly <T6 Weapon which is unlikely. Chrono3 is much better in speeding up the skills rotation, included utility, control and support which are much needed in ET.
Thaum3Enchanter2 will achieve better DPS output eventually, because MATK is more scale-able. Thaum3 is basically a 30% damage buffer for well geared player, PrisonCutter/VelniaMonkey give 30%, and Lightning Hand 500% and attribute give 20% Matk debuff. Not forget you have shrink for normal monster, and you can use lv11 Quicken scroll for bosses. When everything stack up you will see huge different.
In term of farming, linker2 > cryo3, it have CD by half, and guarantee kill on linked, but lightning hand AoE unable to cover whole frostpillar that you need to hit more times. And, linker2 would not be good in bigger combat.
It is all up to what you are going to do with your enchanter and how much you are commit to invest.