RAID versus Storage Pools
Solution 1:
In my experience, Storage Spaces became generally usable for most workloads starting with Windows Server 2012 R2. Before then, it was only worth the effort for specific workloads, like Hyper-V storage. With R2, performance is now on-par with other off-the-shelf SAN and RAID technologies. Monitoring still leaves a bit to be desired and some features like re-balancing are lacking. Windows Server 2016 brings Storage Spaces closer to feature parity with other SAN and RAID products.
If you don't already have something like Operations Manager in place to help you keep an eye on it, but you do have monitoring from your server vendor already then I recommend sticking with the RAID solution provided by your server vendor.