CARP VS VRRP, what and how?

CARP like would be better, because it lives in kernel-level, can kriptovat and supports IPv6 (on the other hand, if you have IPv6, it is unclear why then do CARP).
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The only problem is that CARP is available only under BSD. Under Linux there are vrrpd, which personally I was quite satisfied. So you first have to choose not between protocols, and between the OSes :)
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Alternatives — ucarp (miserable facial joints, which lived only until there was no alternative that supports only two hosts, no more), and keepalived, which is good, but for my purposes was too heavy.

We had a problem: Hoster says use VRRP as they frost on port IP-MAC and IP kada jumps from sercer to the server, it immediately begins to work.
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Why is the phrase:
-> on the other hand, if you have IPv6, it is unclear why then do CARP