For a tournament setting, I would toss the “individual victory” clause of the zombie apocalypse completely. A&A is best played 1 Vs. 1 or with preset teams and allowing for situations where team members could betray one another could create some really nasty situations.
I forget how Zombie Apocalypse rules work but aren’t they just “whoever has the most uncontested (i.e. Zombie-free and under their control) territories wins”? If so, wouldn’t that just mean Allies win every game without a lot of lucky zombie cards?
IPC Swing is a perfectly fine method of determining a winner once time expires, unless you want to go for something crazy like what WBC does for Revised:
Tl;dr version of WBC Ruleset:
-Strategically important locations on the map (Not always the OOB “victory cities” but they could be) are determined by the TO/community in advance. These are called “Victory Territories”. The Victory Territories are selected in such a way that both factions have an equal number of them at the start of the game (ex. 6 for GER/JPN = 12 total for axis, 4 for USA/UK/USSR = 12 total for allies)
-The Victory Territories are explained to all players, and counters indicating where they are location are placed on the map (these can be homemade for next to 0 cost, or can even be taken from other games, like AA50’s Victory City Tokens).
-Once time expires, whoever holds more VTs win. If VTs are tied fall-back to IPC Swing.