Demolisher tank commanders are hot right now with the custom regiment traits spotter details and gunnery experts. Tank Ace Manticore or two with the traits Full Payload are also common. As vehicle heavy as it is you may be tempted to go Mech Guard, or bring in a lot of elites like bullgryns to screen and fight. Melta is cheap right now so it's fun to look for ways to lay it on such as devil dogs and adding sponsons.
As an alternative you could try going mostly infantry, as people are often taking elite infantry and dishing out extra damage and AP that are inefficient at 250+ guardsmen.
I still don't have enough bullgryns built or total infantry to really push one way or the other :(
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