i think alot have to do with the many "reversal times" encountered during an equities 6.5hrs intraday session. the potential reversal points are only minutes apart, from 9:30amEST open to 9:35, 10, 10:30, 11:15, 12 (lunch doldrums), 12:30, 1:30, 2:15, 3 (bond market close), 3:30, to 4pmEST close. it is unlikely that you can enter a trade with tight 8cts stop and hold it through lunch doldrums or even till closing. if you widen the stop loss to give room for pullbacks, then you have to take less shares hence affecting the win-to-loss ratio, unless you know how to add shares (and adjust stop) along the way.
with forex, the so-called reversal times are wider apart. forex "day" session starts at 5pmEST roll-over/settlement time to 8pm Tokyo open, volume dries up 11pm, picks up again 2amEST Frankfurt/Paris open, then 3am London open, 4:30am news events, dies down 7amEST, 8am New York open, volatility picks up 8:30am news events, 9:30am equities open, then 11am London close. the reversal times in comparison are hours apart compared to minutes apart in equities.
for example, if you enter long CTSH at 11amEST,
http://1.bp.blogspot.com/_buPOR1D4eXw/TLiy-fVBMRI/AAAAAAAAE3A/XFf5pknzilQ/s1600/CTSH.png and got a winner going, you have to close your position for profits by 3:30pm or 4pm close, assuming you are not shaken out by pullbacks. this 4.5 hours hold is considered "long term" trade to a scalper/daytrader.
with forex, if you enter long EUR/USD at 1pmEST,
http://2.bp.blogspot.com/_buPOR1D4eXw/TLaHyvhXocI/AAAAAAAAE1g/Zz9wNk52U8w/s1600/EURUSD.png and held it till Tokyo session, you got a +100 to +140pips winner over 11 hours trade. even this is considered "short term" daytrade by many forex traders since it is between Tokyo/London/New York inter-session timeframes. of course you can also scalp for +10pips +20pips just like you can scalp equities for +8cts +15cts.
also, with forex the geometry and patterns are more predictable. in previous EUR/USD picture we know to take profit at -100%/+161.8% fibonacci extension/projection. and in this USD/JPY example,
http://4.bp.blogspot.com/_0P0u3evwCqg/TLgLBuJ_1VI/AAAAAAAAESk/mVVPoD_pDrA/s1600/USDJPY.png we know to take profit at 127.2% projection after a AB=CD move. you can't do this kind of analysis with equities since the reversal times are minutes apart and the geometry breaks down. and symbols from one sector to the next sector behaves differently (biotechs, oil, foreign ADRs, healthcare, education, airlines, financials, high tech, etc).
with forex you only concern with each currency's strength/weakness, general market sentiments (risk aversion, risk appetite), cross-currency moves, and match these with you knowledge of price action and maybe some fancy indicators. for example if EUR/GBP shows EUR strength, and USD/JPY shows USD weak, you go long EUR/USD when the risk appetite sets up. there are also less symbols to focus your attention on, compared to 9000 (or more) symbols in equities where you sometimes get caught playing an unfamiliar biotech name or thin volume stock. with forex it is only EUR/USD, GBP/USD, EUR/JPY, AUD/USD, USD/JPY, USD/CHF, AUD/JPY, USD/CAD etc. looks like alot of symbols but it really is only the risk currencies (EUR, GBP, AUD) vs the carry-trade/low interest rate currencies (USD, JPY) with some playing CHF and CAD or even NZD. not too many to focus on and they are all correlated as cross-pairs.
i myself is moving towards forex daytrading even though i still daytrade equities. hope this helps. just my own experience.