.40 cal: if you too much of a man for 9mm but are a puss for .45
no, the .40 is a great round that hasnt really been around all that long. late 80's early 90's if im not mistaken. proven reliable seeing as there are alot of law enforcement officers that carry .40 both on and off duty. cheaper than 45's to shoot and reload.and you better bet your as$ that it will detour a threat. easier on the body when shooting although not by much. i think that the winchester 230gr that i shoot is somewhere close to 900fps and at 50yds impacts at 360-370ft pnds.
the .40 S&W made by winchester is 165gr something like 1000fps and 360-370ft pnds at 50 yds.
the 45 i can get a wally world for $30 per hundred
the .40 i think is a few dollars cheaper like 20-25 per hundred. this is all target ball rounds. i dont shoot hollows enough to remember the numbers.
the xd is a great weapon. made in croiatia i think. i own the 45 and have shot the 3" .40. both guns are great. light weight polymer frame, no hammer so it isnt going to snag on your belt or shirt. 5-7 lb trigger pull, loaded chamber indicator and fireing pin indicator. has a trigger and a grip safety but i find these very useless. extremely easy to take down for cleaning, just flip a lever and pull the slide off. however you do have to dry fire to remove the slide.
i have heard that xd replacement parts are hard to come by, but i dont know how legit that is. you want night sights they go on no prob, also the acc rail on the front make adding a laser very easy( i bought mine for 45 off the internet and it works great) i have put close to 1000 rds through it and only stove piped once because of cheap a$$ wolf ammo. (about 200 wolf rds downrange)
the glock in my opionion is the only comp to the xd. the glock 22 is the .40 cal. the glock is the most widely used pistol around the world and for good reason. they are reliable and dependable, all the while staying affordable. 6-8lbs trigger pull on the gun i fired. you know the trigger is there. glock replacement parts are very easy to come by. there are match grade triggers and barrels everywhere for just about any variant of prices. the grip on the glock seems too canted for me. it seems like your holding the gun under parallel. the glock is coated in something called a Tenifer finish. from what i hear its what makes the glock so corrosion resistant.
i could keep going but im not writing a book just giving an accurate review of the weapons. im not sure i answered your questions but im sure you can get something from it.