How do I calculate the cost for the spread between buy and sell quote?

True. You don’t pay the spread twice or even once, rather it’s half each time.

 

I’m confused between traditional and ECN brokers. Which one’s better and any name you could suggest?

 

One of the reason’s I prefer ECN broker is that there is zero broker interference in the trade. Like with fxview, forex.com, ICM, I’ve never had the problem once in trading where I was re-quoted a different price. Because I’m an intraday trader, every second and pip matters and such re-quoting could affect my profit.

 

There’s a difference in the spreads. Traditional accounts offer fixed spread like 2 pips while ECN brokers offer variable spreads.