I think the increased range would be best. With the current range you get a volley in then have to get them back, or they die. But if they have more range then you can use them a bit more like archers, get them to high ground and shoot below.
Plus the opponent will not be expecting matchlocks to shoot from that far, and will let his guard down.
Also, moved to Multiplayer.
[This message has been edited by Liam_the_Spartan (edited 07-07-2011 @ 10:55 AM).]