I bought the aluminum one because its cheaper. But if I were to do it over, I would buy the stainless steel one. From what I've researched, the stainless steel one delivers much more even results because it has better heat distribution.

Another important factor is to have a Cast iron skillet or similar under the pot. This helps for more even heating also. Or you could do what I did and buy a cast iron electric hot plate for your heat source. Here is the link: https://www.amazon.com/gp/product/B081DMHYBD/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1