Unreal is a beast. It has a pretty nice editor and a lot of learning material to get you started, but it is a huge resource hog. It takes up a ton of space, uses a lot of RAM/VRAM, takes ages to build (If you care at all about getting the latest and greatest you will be building it yourself from time to time.) Plus all the projects made with it are super bloated, even a simple test program will be a GB or two in size unless you put in the effort to strip out all the unnecessary crap, which is almost never worth the time it will take. The source is a nightmare too, so even though it's great they make it available to everyone who signs up for an Epic account, it's likely you won't be able to do much by way of editing it in any significant manner without years of game engine development experience. Most decent sized teams have to hire on a seasoned pro to take care of any engine level fixes and additions they may need. Plus it's just overkill for the kinda game concepts most folks are likely to come up with for an adult game they can realistically hope to accomplish on their own or even with a small team.
IMO, Godot is about the best all around engine for solo/small team game development if you want something more than Ren'Py has on offer. It is pretty small, lean on resource use, free and open-source under very liberal terms (MIT based license, which means you just need to keep attribution in place in any engine files you redistribute), decently quick to build and has a surprisingly clean and easy to navigate C++ code base, which is pretty rare. It also has a nice editor, with a lot of bells and whistles. And it's updated a few times a year with great additions and optimizations. The only downside to it is that it's still got a relatively small user base when compared to giants like Unity or Unreal, but there's a pretty strong and knowledgeable community surrounding it and the lead devs are pretty responsive within it.
Guys, do you thinks a 3D person adult game, could be profitable in the market nowadays?
It's hit or miss. If you can come up with a compelling story line, or at least an interesting plot to keep people hooked, and you got decent enough art and are willing to put in the effort to get it in front of as many people as reasonably possible, then yes. There are some devs who do pretty well out there, though not all by a long shot. The market is getting more flooded by the day, meaning you need to be able to set yourself apart if you want to win folks attention and become successful. But there'll always be a market for decently high quality work, so just strive to always do your best with anything you set out to make.
