I've been growing for several years, and have tried many different strains.
First off I have to say that the strain you choose to grow is dominated by your location. Short growing seasons reqire a indica dominant strain or a sativa like C99 that is a seven week plant.
That said I planted six Mr. Nice from clones that I took a chance on and am so damned impressed with its vigor and stamina that I am considering growing nothing but this strain! I haven't had a chance yet to give it the old smoke test, but I've never seen a plant grow as lush and beautifull as this strain. I planted on May 15, they where around a ft. tall at the time, and now they are all over 5 ft. tall and just as big around. Thats only 2 months growth! Kind of scary! Also I've noticed that they seem to be a bit more bug resistant than my other strains. I have no reason why this is so, but I'm happy with that.
For short growing season areas, and for those that prefer a sativa to an india I can't recomend anything more than C-99. or cindy 99 as it is also known as. I grew this strain last year and it actually matured faster than some of my indica dominant strains. I harvested mine in late Oct. It is also a good producer, as I averaged around a lb. per plant. But watch out for powder mildew and bud rot on this one, as it is a bit more prone to infestation.
Hope this helps