at low-medium attrition, nail storms are the consistent best answer.
at medium-high attrition other setups may occasionally make sense:
8xSAM sentinels if you need to hit first (i.e. against 8 nailstorms defending). No AO crit sucks - but once their boost is getting closer to yours you can get wins a while longer/more cleanly by taking out 4 defending nail storms where they stand rather than trading turns with them).
8xSAM sentinels again if there's a lot of artillery (or hover hammers occasionally - but kinda hit or miss as to how well they work; stupid range issue).
But... if you care about medium-high attrition, get out of SAAB asap. SAV and SAJM are improvements in this department.
OTOH, If you only care about low-attrition autoing some people like SAAB better than what follows.