I would definitely take the Glock 23.
1: its a 40 cal compared to a smaller 9mm round
2: it is only a 2 round mag capacity difference compared to the Glock 19
3: all the lengths and measurements are the same as the Glock 19, so it feels the same to carry
4: Weight difference is very minimal Glock 23= 31.03oz.(Fully Loaded)... Glock 19=29.98oz.(Fully Loaded) (small weight difference, but large gain in bullet size)
So all in all...you are not losing anything by going with the Glock 23. except 2round mag capacity and about 1oz of overall weight. BUT YOU GAIN A MUCH BETTER ROUND. 40s&w is a much better MAN STOPPER, 185gr compared to the 9mm 115gr.
Hope this helped your decision
-GY6vids @ www.youtube.com/GY6vids