difference between quark air master and monster pro

ok, the a quark esc is good and cheap for me?
mmm is bad for me because i must order in usa and when the esc is broken i have high fees for sending it back. i read much bad thing for this esc, its often burns. whats about the v3 version? shall i wait for it? i think this is the cheapest esc for 6s?

will i need the quark 125a or can i use the 80a version?