I guess the answer to your question depends on whether you are evaluating a single security or a portfolio. In the former case, TS offers some advantages over the built-in EST (e.g. problem of remembering values at specific points in time) but it is no good at optimizing variables. Unfortunately, TS does not help you with optimization of money management parameters. If you are evaluating a portfolio of securities then TS is needed because ETS only provides elementary average statistics on a global basis (return, success rate, number of transactions). In the case of portfolio simulation the Professional version of TS is required to carry out a proper evaluation since the Enterprise Version will yield results for a single simulation. My conclusion would be to go for the professional version of TS if portfolio simulation is what you are after, otherwise settle for the Enterprise version. To accelerate your learning process have a look at http://www.backtestingmadesimple.com.au/ .
minnamor