OBW/IBW there is a huge difference in he comfort of carry.
A SD9 as a concealed weapon to carry is to heavy for me. I'll think a SD9 is a great tool but for carry on a daily base?
Smaller weapons pulling not so much and honestly if 9-11 and a second 10 rounds don't help than you are in big trouble anyway.

For Cary is a M&P shield or Taurus PT740........ IMHO big enough.