Hi Max
An interesting question this one. I'll give you my opinion:
When a stock goes XD, the share price drops temporarily intraday. In my experience, TA doesn't work well with stocks intraday, so it shouldn't make a lot of difference which method you use. Daily TA charts will absorb the minor dividend corrections, so it should make any difference on the grand (daily scale).
I would be interested to see a couple of chart pics showing a stock using the TA + Dividend and TA - Dividend for comparative purposes, if you could provide them.
Best
JD