Depends on the target's AC and my attack bonus.
If I have a +7 or higher attack bonus and the target has an AC at or below 10 (oozes, zombies, etc)? 5 attacks at disadvantage.
If I have a +5 to +8 attack bonus and the target has an AC of 16+ ? Two attacks at advantage.
If I have a +5 to +8 attack bonus and the target has an AC of 11 to 15? Three attacks at normal.
Generally, I'd prefer the two attacks at advantage. Better chance of hitting mid-to-high AC's, and more chances to crit than with 3 normal attacks. Especially if I can add extra dice of damage to the attack (hex, smite, weapon with extra damage dice, etc.) The more dice you roll for damage, the more you are rewarded for crit fishing.