Well there are a lot of different strains out there. If you are a fan of heavy indica then your best bet would be a classic strain like northern lights or Aurora Indica. They are both pretty short and busy plants and whats best about northern lights is that it is highly adaptive to any kind of indoor growing. On the other hand Aurora Indica has a mango/citric aroma with a heavy indica buzz. There are hundreds to thousands of strains out there, just make sure you do your research before you spend any money on an unwanted strain. But Im sure just about any strain you choose is going to be much better than any bag seed unless its from some dank.