Please send your suggestions for Best cakes and Worst cakes in order to compile the definitive list. This was started some time ago by me but left to fester.
Some people say a cake is a sweet baked product which goes hard when stale and a biscuit is a sweet baked product which turns soft when it goes stale. This applies to Jaffa Cakes I think which are classed as cakes not biscuits which makes a difference to the VAT charged on them in the UK.