Long time ago? You mean FreeNAS is safer than Storage Spaces?
Generally speaking, yes. In theory, a Storage Space with parity and ReFS is fairly equivalent to ZFS and RAIDZ1. However, ZFS is much more robust, given its longer lifespan, and more bugfix time. Also, ZFS supports dual (and triple) parity volumes, which should be considered the bare minimum today for reliable storage. Under the hood, ZFS has a number of optimizations and features that will probably make it to ReFS eventually, but are currently lacking.
A storage space with NTFS is much less safe than FreeNAS. NTFS does not support checksuming, so it cannot detect and correct bitrot or other data errors.
Well, i used to run hardware raid 10 with r/w speeds around 300mbps, so 130 is kinda low at least for me
There was a reason I was exceptionally clear about the units I used.
If you are only getting 300Mbps (megabits per second) with your RAID10 array, then I would say something was wrong. That is exceptionally slow for even one hard drive. On the other hand, if you are getting 300MB/s (megabytes per second; notice the capital B), I would still say that's slow for RAID10. For read, you should be getting somewhere between 1.5-2x your write speed, so the fact that your read and write are about the same tells me that something probably was wrong.
Storage Spaces/ReFS is known to be a terrible performer, especially with parity. ZFS runs circles around it (and that's saying something). However, no matter what your file system is, you won't ever get faster than your network.
Well, as few as i can, but if theres something must have (like stronger cpu) im fine with costs, i got drives and 8gb of DDR3 RAM, im thinking about cheap itx mobo (ASRock AM1B-ITX) with strongest CPU that i can get for it and Fractal Core 304.
Your CPU is unlikely to be a bottleneck, especially for your use case. You could probably get by with an Avoton system.
The bigger problem would be your choice of motherboard. Intel systems are generally preferred over AMD here for many reasons, the least of which is that Intel systems generally don't have problems, and the same can't be said about AMD systems. Also, that motherboard is fairly consumer grade, which can cause problems with FreeNAS. Lastly, that motherboard has a Realtek NIC, which is well documented to cause problems in FreeNAS.
ZFS is super memory hungry, so the more memory, the better. If you're serious about data protection, then I would consider ECC memory an absolute must.
This is just an intro. There are stickies with thorough and detailed hardware recommendations in the forum. If you want to go FreeNAS, then I strongly suggest you read those, spend some time to pick out your ideal FreeNAS system, and then create a new post with your hardware so the community can give you feedback. That should help get you on the right track.