TAM or wait for the pack sales to get leo2a4pzbtl?

so i was wondering would it be better to get the tam for ~25 eur (a bit less because i can use some gjn) or wait for leopard 2 to go on
my current situation on germany is that im tier 5 with all tanks unlocked and the gepard from tier 6, i do not have anymore research. my main fear with the tam is that i cant get the leopard 2a5 and later tanks, but at the same time i might spend the extra money for the leopard 2a4 pack and since my life got busier, my prem time would go to waste making my money go too