You have a higher chance to obtain coil and myth gear then CT
This statement is flat out wrong, sorry. You can repeat CT as many times as you like per week until you get an item you want. So the effective chance of getting something is 100% every week. Unless you don't work for it, then your chance gets reduced.

Coil does not offer such great odds, and With Myth cap at 450 tomes you'll only be able to get one accessory per week.