[tor-relays] Which is best for Tor: libevent v.2.0.22 or v2.1.8?

[Steve Snyder]

With the long-awaited v2.1.8 of LibEvent recently released, this brings 
up the question: which is more suitable for use with contemporary 
versions of Tor, the older v2.0.22-stable or the shiny-new v2.1.8-stable?

Thanks.