So I just got thunder 3 and I was looking over the tool tips and noticed that they all have the same dot damage. So they only difference is up time on the dots, cast time of the spells for each tier and slightly more initial damage.
So my question is, is it better to just use thunder 1 initially for the short cast time and lower mp cost and only use thunder 3 for the procs? The dots tick the same its just only up for 18s instead of 24s and I don't see the initial damage making much of a difference between the two given that thunder 3 is almost 4 seconds cast time compared to the 2.4s thunder 1.