easiest to grow? Pretty much depends where your growing.. For example, some strains of MJ which originate in the tropics are more difficult to grow if you live in Arizona but if you reside in Hawaii they may be quiet easy for you to grow.
As for an easy to grow with high yield, may I suggest Northern Lights
AK-47 is another, Lemon Sour Diesel, Power Wreck are a few others.
Also easy to grow and high yield is all relative. What one grower considers a high yield may not be to another grower. Same with ease of growing. Personally I find its a weed, it is pretty hardy and takes quiet a bit to kill it. But then again, I have not grown every strain out there, perhaps some are as delicate as a rose.... Oh wait, I have trouble killing roses too.. make that a lily or an orchid.