Ideally you'll want both if you're selling. A couchlock high and a cerebral high. I always go to the club with the most variety, so make sure you have a variety people can choose from, not just 1 strain.
Endless Sky by Dr Greenthumb is one of the most potent indicas, large yield, and has a 6 week flowering pheno.
Jack The Ripper by Subcool is a 9 week flowering Haze cross, the most potent bud I've ever had, exactly the high I want but a much smaller yield.
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What kind of client base do you want is a more apt question. Do you want to deal with people who are most concerned with the cheapest price and any potent effect, or those who are more discerning about their bud and are willing to pay a bit more for the type of effects they want and cannaseur bud.
You are the grower, you decide what your market wants.
you could take 5 people and give them each a sample of 1 indica joint and 1 sativa and you will get completely mixed reviews. i know people who don't feel like they got their money's worth unless they are catatonic and drooling. others like something that makes them laugh. others like to be confused. purplehazin offers the perfect solution. have at least two opposite-ish strains and let the people tell you what they like.