FTR, Windows 10 crashes or hangs up plenty - you've just been lucky. In Windows 7 (using PC for same shit I do now) I used to have up times of 3+ months. Now I'm lucky to get through a month without something getting porked and having to restart, let alone the Windows crashes making it difficult to test the stability of, say, an overclock. Windows 10 doesn't fight shit regarding issues that want to crash a computer, regardless of whether it was due to hardware, software, firmware, shareware, or binary chlamydia.
Also, Windows Restore Point feature is for rolling back recent changes to the operating system environment. It can and should be used before every new program installation and every Windows Update, and make custom names that you can recognize like "before AOMEI installation" or "before Oct2018 WinUpdate". Windows Restore Point is not a backup disk image creator as you suggest, and therefore you are right when you say that your AOMEI Backuper is better than Windows Restore Point at restoring files from a hard drive backup source.
Windows Backup and Restore is a built in feature complete suite of functions that can create a system repair disc, create a system image, restore all users' files, select another backup to restore files from, and run tasks on a schedule for maximum protection. In Windows 10, the feature that does what your AOMEI Backuper does is called "Create a system image", and it's found at the link Control Panel\System and Security\Backup and Restore (Windows 7)
Using a third party software for file system backup and restoration is a personal preference, but I will say that it is a bit redundant. And the way you say "I don't like doubts" infers that you don't trust Windows to perform these tasks, so you use this third party software AOMEI. Let me ask you this: why do you trust Microsoft to be the backbone of your entire file system, to be your Operating system, yet you don't trust the tools it comes with? Is it just for the user interface that AOMEI provides? Because Windows backup is perfectly fine, works very well, and can be depended upon just as much as any backup.
I've never heard of AOMEI myself, I've been around the block a few times, but I had to look it up. I'm familiar with Acronis, NovaBackup, SpiderOak, Carbonite, Dropbox, etc. but I gotta say I was not surprised when I found AOMEI in a Top 10 Free Backup Software advertisement that looked like an actual article about backup softwares. I'm sure they are fine, but all things not being equal, there's no reason to recommend to someone that they backup their computer for peace of mind, and by the way, use this AOMEI software to do it. Windows can do all of this and if you can trust it to manage your files 24/7, you can trust it to create your disc image backup files, too.
*Don't be confused by the "(Windows 7)" in the title, it was stupid of them to leave that there and is maybe just to delineate between a replacement system that is perhaps coming in the future, who knows. It works for all systems, and is the best solution for making a Windows OS installation repair disk and a System Image disk, both together being the entirety of your C: drive and OS. Personally, I use 2 separate Class 10 USB flash drives (16GB and 256GB respectively) and while I have copies of these on external hard drives, I trust that these two USB's have everything I need to restore my system. These drives are not in the same building as the PC in case of fire.
I use RAID-0 across 2 Samsung EVO 120GB SSD's, the M.2/NVMe drives being brand new and too expensive when I built this, and so I could literally lose everything in the blink of an eye (300ms). I run a backup schedule to internal HDD's that are not the C: drive, and I run the System Image creator monthly. I already paid nearly $300 for Windows 10, I'm certainly not going to pay some other company for a tool that is included in Win10, and DEFINITELY would not install any redundant "freeware" onto my system unless there is no other alternative. But again, third party software tools can be a personal preference, for say, the UI, or other features. Still, Win10 can do it all already, was my point.