Seeds are seeds are seeds. Hydro(ponic) is only a growing method.
Sativa's are plants that are usually very tall and spindley with spaced but sites; they take approximately 2-6 weeks longer to mature depending on species and they provide a very cerebral high; mental and trippy.
Indica's are plants that are usually short and squat with tight compacted but sites and take less time to mature. Indica are Indica hybrids are preferred by indoor growers because of their short stature and fast maturation. They provide a very narcotic high (couchlock) with a heavy body buzz.