Stock Pot vs. Dutch Oven / Sauce Pot I currently have this on order and plan on using it for stocks, broths, and boiling grains/vegetables.

My question is: what are the advantages of a dutch oven / sauce pot over this when it comes to most other types of cooking? Rather than the advantages of cast-iron vs. stainless steel I'm more interested in the general question of why a stock pot isn't ideal for braising, sauteing, or stew/chili, especially when the one I ordered has a clad bottom and is oven-safe. Does it just come down to the tall, narrow shape and clunky size?

If it really does make sense to also have a dutch oven / sauce pot on hand, would I be wiser to start with stainless steel or enameled cast iron?
The answer is that both can be used just fine for the same purposes, however stock pots tend to have much thinner walls than the bottom and thinner than those found on Dutch ovens. The thinner walls mean that they retain less heat and so are less efficient at cooking on the stove top (e.g. soups), and more likely to burn or stick around the walls if placed in the oven - because of the faster heat transfer on these thin surfaces. 

Stainless steel is more prone to sticking for some items too (e.g. eggs, meats), and is relatively difficult to season (it's generally not done to stainless), whereas cast-iron can be seasoned very easily, it's more or less mandatory for this material and essentially makes it more or less non-stick.

Enameled/ceramic-coated cast-iron pots such as the Le-Creuset ones are generally non-stick from the shop and have the same benefits as cast-iron.

Having said that I use an oven-safe stock pot for making things like pasta-bake, where it is in the oven for relatively short periods of time (~40 min - 1h), and don't generally have any problems.