Assuming that the saddle position is correct (height, fore/aft and tilt), time in a saddle is what helps determine the right one for you. As you have stated, the wider one was "just not it". But, as for the stock saddle, please be sure you have had a fit session by someone who knows about a bike fit. Did you get the bike new from a bike shop? If so, they should help with a fit. Otherwise, picking out a saddle and then doing some honest ride time with it will help find the right saddle for you. There is a break in period, and usually after about 3 weeks of ride time will tell if the fit is good. By all means, if it just flat out hurts to ride it in the break in period, switch saddles and try again. The saddle is the most personal part of the bike and must feel good to you.
Cheers