i've alway's wondered, which is better, meltaguns or plasma guns. i will point out the advantages of both weapons and say which i prefere at the end. by the way, im pointing out issues for an ig army.

firstly the plasma gun. rapid fire strength 7 ap2 24". quite a destructive weapon. in and ig army, it will be trouble when it get's hot, unless it's in a comp command squad with carapace armour and a medi kit (gives squad feel no pain).

now the tank busting meltagun. strength 8 ap1 assualt 1 12" melta. can take out most vehicles (i think it can a a monolith) and will kill most infantry unless it has an invun. also, the meltagun cannot get hot and is cheaper than a plasma gun.

in an ig army in my opinion the better of the two is the meltagun as it won't get hot, gives the squad with a meltagun abetter chance of picking off tanks and heavily armoured infantry. if you collect marines, then you don't worry about getting hot with a marines high armour save. if you have a different opinion, just comment.