For firewalls, what`s best? Load-Sharing or High-Availability?

[hosts.deny () gmail com]

I`m working with a customer that uses Checkpoint Firewalls and he wants to know what`s the best for their environment, 
is it Load-Sharing or High-Availability ?

Actually, they have 3 cluster of HA firewalls that are one on Internet, another for Users and another one for the DMZ. 
Is it a good topology ?

What do you think buddies?

Thanks!

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