I prefer not rolling at all like with 5e's point buy or PF2's bonuses, but if the DM requires it I always keep what I get, no rerolls.
It's how I ended up with a 6 STR, 7 DEX, 8 CON, 10 INT, 12 WIS and 12 CHA Druid in a 3.5 adventure. Somehow she survived the whole thing.