So I got my LTC in my state (Mass) not too long ago and my first gun was the M&P 40C which I love. I went on to find a mint condition like new 2nd Gen Glock 19 which I also love. I've shot both and to me the whole 9mm vs .40 S&W isn't a huge deal I like both. Now after tons of research and watching videos day and night I am torn between getting a 9mm shield or a 40. I am asking everyone out there who has shot both and what they prefer...please help!