I currently own a xd40 5" tactical. I use it to shoot in the range and home defense. My friends is now convincing me to start shooting competion, tactical or so. Would my 5" tactical would work or 4" service will be better? I am now thinking of trading it for 4". Can someone please give me an advise or opinion. This forum made me decide to get the XD40 and all of you are always in good help. Thanks!