indica is a better type canabis plant to grow indoors as they grow shorter that the sativa type also normally the buds are bigger.theres many types of indica and sativa strains..also you can get hybrid cross witch has genes from both indica ans sativa.....heres some info of the web
...
INDICA
An indica plant is usually not too tall (about 1,5 mt max) with the typical shape of a Christmas tree. These plants are originated on high hills or mountain areas (ex. Nepal, North India etc).They are robust and easy to grow. They develop big buds that are really dense, with the calyxes pressed together. They tolerate a low level of stress pretty fine. The effect of an indica plant is so called "stoned" or "corporal", a strong body and mind relaxation. If we compare it with a wine, and Indica is an heavy red one.
SATIVA
A sativa plant is usually tall (from 1,5 mt on) with short branches. These plants are originated in tropical areas (ex. Caribbean, Thailand islands, etc). There are more buds sites than on an indica, but the buds are somehow less dense. The effect of a sativa plant is so called "cerebral" or "high", less strong than an indica on the body and with a more pronounced effect on the brain, where it goes from a creative feeling to a trippy one according to the power. If we compare it with a wine, a sativa is the champagne of cannabis.
RUDERALIS
Cannabis Ruderalis is not meant for marijuana production. The Ruderalis is a specie of cannabis originated in Russia, with height around the half meter, no side branches and little or no buds. It is used in the production of hybrids to make them more resistant, or to let them flower according to their age (instead than the number of hours of dark that they receive, like every other cannabis plant).