What's the best Leopard 2A7 modified version, like the 122 B+ included?

Just want to know

122B isn’t a 2A6 or 2A7, its closer to a 2A5 but not exactly

Just a modified 2A5

Leopard 2A7HU, may not have a lot of benefits compared to the Leopard 2A7V, the 12.7 mm heavy machine gun being one of them do give advantages in some situations.