Not even Astartes 2 will make me buy their shit streaming service. I repeat, the original guy sold out for probably less money and less recognition than as a single author, and if he gets axed because Warhammer+ is doomed to die he'll have only himself to blame for not continuing to be his own boss. I will pirate the shit outta it if it's nearly as good as the first animation, which I would be surprised if it wasn't.
I believe a Vindicator works well, but the range is...I'm not sure but I believe it's shorter. I think Forgefiends and Maulerfiend work well too if a Daemon Engine is in your budget. Thought ultimately a Dreadnought is probably the best, what weapons work best against other Dreadnoughts? Lascannons? Can you work Lascannons into your infantry?