10th edition thematic anti-tank options

Been struggling a little dealing with my brothers Imperial Guard Tanks recently so was wondering if anyone had some guidance on efficient yet thematic anti-tank units in 10th?

We're playing using the crusade rules at the moment, which has been great fun and Havocs with the +1 BS battle trait upgrade are tasty but wondered if people had thoughts on more thematic options!

Oblitertors? Or Lascannon Helbrute and predator annihilator combos?