Here's my take on saddles (as a fifty three year old overweight guy):
There are two main issues (assuming your bike is set up correctly and your seat is relatively level and at the right height). The first one (and easiest to solve), is chafing. If chafing is the issue, a narrower seat may be in order. The seat that came stock on your bike should be ok. Padded shorts and proper wicking of sweat will also help. Do not wear underwear under your bike shorts. After a while, your skin will toughen up and chafing will be less of a problem.
The second issue is pressure. How your butt fits your seat. You may have excessive pressure on your sit bones, producing bruising and pain (ouch). Or you may be putting too much pressure on your perineum (soft tissue behind genitals), producing pain and possibly numbness. The first oder of business is to get the pressure off your perineum. Start with a level seat, then micro adjust. Assuming you are in a race style position, you need your seat level enough so that you can take your hands off the handle bars. Too much forward tilt, although it takes the pressure off, puts too much weight on the arms. Too much backward tilt will exacerbate the problem. If you are not in race position, and you are sitting more upright (using an adjustable stem, extra spacers, lower saddle, or whatever) you have the wrong bike. To get the maximum comfort from this bike set it up as it was intended. If a race style position seems uncomfortable at first, you will get used to it. If, after getting a proper set-up and fit, the saddle is still putting pressure on the perineum, you may try looking into saddles with cut outs.
Pressure on the sit bones is another matter. Some saddles just simply don't fit. Everybody is built different. Try different saddles. I have a similar bike to yours, and use a Brooks B-17. These things will, after a few hundred miles, start to conform to your anatomy. The pressure will be evened out over a wider area (less pressure per square inch) as the saddle breaks in. Brooks saddles get mocked because of their dowdy looks. They are also as uncomfortable as hell at first. And if anybody else rides your bike, chances are they will be appalled at how uncomfortable it is (after all, the saddle has conformed to your sit bones. It does not have padding or gel which would make it more universal). For me, Brooks saddles are the magic elixer.
Kevin