Wow!  This is probably the hardest question we get because there are so many variables involved - elevation, time of year, the size of tent you have, type of wood being burned, how dry the wood is, how much air you've got feeding the fire, and your comfort level.  All of these are determining factors in which stove is the best choice for you.   

Our smallest stove, the Valley, is capable of heating a large tent.  The question is, how long do we want to heat it?  While it's true that a small stove can heat a large tent, it can only do it for a short period of time before it must be restoked with wood.  It all comes down to this, the more weight you're willing to carry, the larger stove and longer burn time you can get.  Much like the tents, if you're between two sizes of stoves, go bigger.  You can always start a small fire in a big stove.  You'll be happy if you get the largest stove you're willing to pack in.

As a general rule, the Valley is most suited for tents up to 10'x12'  (We use the Valley in our 12'x14' because we pack in 6 miles where weight and size is significant, but this means more stoking/adding firewood for the hunter with the weakest bladder!)  

For tents 12'x14' to 14'x16' the Ridge is commonly chosen, while for larger tents moving up to the Peak is recommended.