» Tue Jan 19, 2016 8:41 am
You don't need Luck when using Pistols. It's just that most Luck builds choose to use Pistols for their lower AP costs. If you aren't interested in investing in Luck, you don't need to.
As for the important Luck perks, there are 4:
Four Leaf Clover - every hit in VATS has a chance to refill your Crit meter. Nice for reducing downtime between crits, but a Lucky Legendary weapon does much the same thing. A Lucky weapon doesn't render this perk useless, but you may not be interested in investing in this perk if you have one.
Critical Banker - allows you to bank up to 4 extra crits for use against tougher targets. Nothing can render this perk useless, so it's highly recommended for a Crit build.
Better Criticals - increased damage on a crit. Since Pistols don't usually hit as hard, this can ensure easy kills, especially when stacked with other sources of Crit Damage.
Grim Reaper's Sprint - each kill in VATS has a chance to refill your AP. Great for extended fights; however, it's rendered useless by a Relentless weapon.
As for Legendary prefixes, two of the best are Relentless and Lucky. Relentless weapons don't hit as hard, but the ability to get all AP back on a Crit speeds things up considerably. The Lucky weapon, on the other hand, is slower (since you have to wait for your AP to regenerate after each VATS sequence), but it hits significantly harder. If I had to choose one prefix to recommend, I would suggest the Relentless weapon. Lucky is great for single tougher targets, but a lot of fights are against groups; for those, the speed of the Relentless prefix will be more useful.