I trade both futures and forex and use a forex chart for analysis -- no gaps from rolls. Forex is cheaper to trade and more liquid around the rolls. The money is segregated in futures though. I can see though that w/ forex.com and fxcm.com being publically traded that there is probably more security there -- I have accts at both. Forex.com also now owns OEC aka FuturesOnline.com.

To be able to look at years of uninterupted data on one chart makes legitimate analysis possible. As a swing or position trader your benchmarks must be in forex. It's pretty much impossible to get statistical validity in technical analysis using a futures chart where you are looking at different data points every three months. Not to mention having to roll your position every three months -- as in futures -- is a pain in the ass.