Question between sativa and indica

Greetings,
What's the main difference between cannabis sativa and indica?
i know that the leaves of indica are more large than sativa and indica is smaller than sativa. so, i think sativa 100% only growth outside, really? and sativa usually have 2% of THC and indica more than 5% ?
Someone allready grow a 100% sativa?

Im growing 100% indica.....ATA TUNDRA by SEEDSMAN. Its very bushy and 19% THC
Ata Tundra Seeds - cannabis seeds

im growin a 95 sativa cali skunk , its pretty high in THC about 13 % , if youve ever had haze thats wut sativa is , it will give you a up feeling kinda of high , you know you almost feel like energetic and giggly while indica get you stonnneeedd like you dont wanna move , I like both , they also have mybrids of both . Indica ive heard has a shorter flowering period than Sativas and ive also heard you get more bud with indicas , next grow im gonna try a indica , but my sativas are still damn sexy

the diff between the 2 is that indica grows short from about a foot to 3-4 depending on conditions. and sativa grows from about 4-15 ft depending on conditions. some say indica gives body high and sativa gives head high and they do to a point but its mostly on the harvest time were you get the desired effects. and yea signs of indica are small fat leaves an sativa long skinny leaves.

im growing something called S.A.G.E. but i dont know what kind it is or anything

S.A.G.E. stands for Sativa Afghani Genetic Equalibrium. It's a hybrid from some sativa from California and an (suprise!) Afghan indica.