HT Gargs is a solid choice for solo play. It will work in groups but is not that easy to handle (Garg positioning).
HT Firebats on the other side deals a huge amount of damage while remaining solid and safe. It's more easy to handle than Gargs because it's all on your shoulders when to deal the dps.
I'd go for bats as most groups I've seen are running it. But I think it's more a personal preference (as anytime in Diablo). Finding a group as Bats WD should be pretty easy too, so this could be another plus.
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