Neither are suitable for you as you are clueless about both. Best to put your money into a safe CASH ISA so that you don't lose it all. You can't expect to get professional investment advice here as we are not trained financial advisers and if you take advice here, you might lose all of your money.
I have 100k to invest, is it best in unit trusts or buy to let venture, as I rent a place that comes with my job
