League of Legends (LoL) Question: Lifesteal Quints

I run ADC about 99% of the time. As far as 2 LS quints compared to 3 LS is that you wont miss that 2% LS but you will miss that extra AD for last hitting. I tried using 3 and my farm started to drop, switch back to 2 LS and 1 AD and it was all fixed.

It's more preference but all-in-all 2 LS/1 AD > 3 LS imo :D

2 LS 1 AD works on everyone, but personally I get 6% LS on champions that I rush IE on -- Ashe, Trist and sometimes Cait. I usually skip vamp scepter on those champions if I can so the extra 2% helps.

But you can do 2 LS 1 AD on everyone if you want, it doesn't hurt.

2 LS 1 AD

Last hittin under tower very important!

I would say it depends on the champion, But I have seen a lot of guides using 2 lifesteal and only one AD,

I think it's that way because the AD quint may help with last hitting and gives you just a little bit more sustain off of the lifesteal because your hitting just a little bit harder for the first level or two, but I don't really know because ADC is my worst role lol

I'm just lazy to do the maths

It is not cost effiecient to run 3 LS quints, because, since each quint gives 2% life steal, by running two, you are effectively the amount of lifesteal you have by 100%. But, when you run the third LS quint, you are adding 50% of your previous lifesteal value, aka it is half as cost efficient as running two LS quints is(2x4 =8, not 6). Therefore, it is only cost efficient to run 2 LS quints, and run 1 flat AD quint. It is also nice to have the extra ad to help with lasthitting :)