Why?

The question isn't quite so simple."Forex" or the Foreign Exchange market is the market for domestic and foreign currencies. It is almost always open and the biggest FX exchange is in London, England.Stocks are traded either on a centralized exchange (NYSE) or on a decentralized network (ATS, OTC markets). I will assume you mean trading plan vanilla stocks (i.e. no derivative securities). I will also assume you are a risk averse individual who will not take on unlimited risk.Taking these two assumptions, I would recommended stocks.The FX market is one if not the hottest securities market today, hundreds of billions of dollars are traded everyday by experts ranging from hardened veterans to PhDs from MIT, some draw on the unlimited resources of Goldman Sachs while some use their life savings (not recommended). FX is a zero sum game, one party wins, one party has to lose. While stocks aren't much better (semi-strong form efficient market hypothesis does seem to hold on average), a healthy return can be made with a minimum of fuss and risk. More specifically, the exchange-traded-fund (ETF). The ETF is an artificial stock that can mimic an index (i.e. there is an ETF for the S&P/TSX Composite) allowing for artificial diversification of unsystematic or "firm specific" risk, allowing you to build a diversified portfolio at a minimum cost and fees. This type of passive investment has been empirically shown to beat most hardcore quantitative and qualitative strategies over the long term, and is best in my opinion for anyone thinking of investing their money. You don't get the risks of FX (or the huge profits, but odds are you aren't yet sophisticated enough to play with the big boys [i.e. UBS FICC] ) and you can maintain a steady and growing return. There are also ETFs made for everything from grandma (broad based north american ETFs) to the young upstart (QQQQ, EWZ [brazil]) and you can tailor your portfolio accordingly.Hope that help a little.

Forex for sure. Especially if you are a technical traders. You are less distracted by choices available to trade. Basically 3 or 6 majors. Not spoilt for choices you conserve your attention span and energy on the task at hand, making money, spotting opportunities on the charts.Compared to thousands of stocks available. At the mercy of liquidity for good charts but little volume. At the mercy of the market makers and the campers of the individual stocks..Forex charts for traders are more distinct and fluid than stocks. So as a forex traders I love the opportunities presented by Forex Charts.Which are more developed. You can drill down by weeks, dailies, 8hrly, 4 hrly and hrly, 15mins, 30 mins and 10mins.Great stuff ! Just pick your time frame. You cant do that with stocks. And you have to look at balance sheet, P&L, CEO statements, business enviroment, industry analysis....etcForex Charts and technical analysis, simple and straight forward. Its all in the chart and there is always a pattern.If you are elliotwavers or candlestickers, you will never never look at stocks again. Its like trading with the pros or the amatuer.And you can practice money management with the leverage of forex trading.Just love it. Unless of course you talk about options but then again the risk/reward for me, option is a very very poor substitute for leveraged Forex Trading.

Both.Stocks offer you less risk and plenty of diversification.Forex offers you higher risks but higher margins which allow you to trade higher stakes with less money.