Sumo were also a bit unclear about the details of what you are signing up to and what the differences between their plans is. I was going to go with them, but they seemed a bit dodgy and another company became cheaper anyway when I did the compare again.

I ended up with Nectr for electricity, GloBird for gas. Nectr did have a dodgy estimate of the total price on their website, but the actual rates were the best. I have found that the Energy Compare site is the best resource if you enter your meter number, as it uses the actual use patterns you have. Make sure you select the option to include time of use plans on the left hand side to see all the options, depending on when you use power you may save money.