The best jeans for showing off your package are... the best jeans for showing off your package. It depends on your build and their cut. The jeans which may work well for me may not work at all for you. Your best bet is to keep trying on jeans until you find what works for you.
Here are some general thoughts which may help.
Jeans which are tight will just squash you flat if they're not the right cut, so tight jeans are not necessarily the answer.
Looser jeans may look better if they're loose in the 'right' places. Again, that comes down to cut. Ideally, they're just loose enough in the crotch without being too loose elsewhere.
For me, button fly jeans fit the 'contours' there better than jeans with zippers, so may be worth a try for you.
Denim varies in weight, so lighter weight denim, or denim with a little spandex in the mix may 'drape' your form better than heavier or stiffer/less stretchy/less elastic denim. For the same reason, well-worn denim might fit your shape better than new denim which hasn't been broken in yet.