Generals, Admirals, Marshalls, Hive Minds:
I have just started a Tyranid Nidzilla based army. Essentially it's for a bit of fun to play friends. Although It's just a for a bit of fun I'd also like to have a chance at winning and thus decided to add a Ravenor brood to my army. The issue however is the multiple choices for thorax weapons. I was wondering what you would suggest and indeed how you've found them to be most effective against Marines, Guard and Necrons?