Not sure if there are any single cams that are being manufactured today. Technology speaking, there aren’t really any true dual cams either. There are now mainly hybrids or binary cam systems. The technology of the single cam bows sorta hit its peak, and the hybrid/binary style has more room to grow.
That said, you’re Your best bet it to find a good pro shop, and/or someone in your area that actually knows what they’re doing. This can be tricky, because there’s a lot of peeps that talk, but don’t really understand the walk.
Back to cam systems...for me, it’s more about how they feel thrown in with the bow geometry and other things. The advancement in string materials has made tuning issues due to string stretch/creep almost nonexistent.
So, find a pro shop or 2 and shoot a bunch of different models and types. Listen to what they say, but be aware of the push. Talk to other peeps, and if possible, find a coach (not the backyard kind) to help get you started. Most everywhere has someone with coaching and shooting credentials that can help you get started.
Don’t over bow yourself (too much draw weight) and get a bow that has an easily adjustable draw length (internal rotating modules are the best IMO for starting out) in 1/2” increments. Finding the correct draw length for you is probably the most important thing, and the rotating mods make it easier to do (no special equipment necessary).