Intel motherboard RAID is fakeraid (it looks like hardward raid, but it's actually software raid and very touchy about what software you're using).
The Dell PERC cards are real hardware raid. I'm surprised the actual hardware raid manufacturers haven't sued the fakeraid manufactures yet for misleading/false advertising.
Performance: You must not be worried about performance if you're using a bunch of SATA disks in a RAID5 configuration. RAID10 is going to be notably faster for most workloads. SAS disks are going to be faster. 10k or 15k SAS disks are going to be faster. 2.5" SAS disks are faster than 3.5" disks. Your 7.2k SATA disks are scraping the bottom of the performance bucket.
Stability: PERC cards are interchangeable and store the configuration on the drives themselves. This makes replacing any component of the array almost trivial (including the whole server).
Friendliness: Really not sure how this has anything to do with server hardware. I can understand you'd want proper documentation as to configuring the device. I can also understand you'd want support from the manufacturer when you have problems. The PERC card is going to win on both those fronts. The actual configuration interface for both is intuitive from the viewpoint of someone who knows RAID.