Learning new words - with Pons or LEO

The dictionary websites dict.cc and LEO are very popular, so now one of the large publishing houses, PONS, has reacted and it has created its own online dictionary:
http://www.pons.eu/dict/search

It also has 'Lexitrainer', which is an integrated program to help you learn the new words that you look up in the dictionary.

But, watch out! You have a lot of choice now, because LEO has also updated its vocabulary trainer and made it much better. Check it out - the Sprachtrainer.