Confused about the article and price sites

schuey87

I am a student so am new to organising gas and electricity. Read Martins article and followed the first 2 steps on price comparison sites moneysupermarket and energyhelpline. I am confused though, having entered the same postcode and same annual usage figures for gas and electricity, the 2 sites are showing me the same products with different prices. For example the Southern Electric Fixed Discount 2010 online is coming up at £908 on moneysupermarket but £1100 odd on energyhelpline. A lot of other prices are different, for the same tariffs, some only by £30 or so but some by a lot more. Which website do I believe??? I am confused!!