If you want the best performance and redundancy use RAID 10 which combines striping with mirroring, but it will reduce your capacity by a half. You can lose two drives using RAID 10 and still keep your data.
RAID 5 is a very good option. It uses striping and parity which gives you good performance and more capacity than RAID 10. You can lose one drive using RAID 5 and still keep your data.
RAID 1 is only mirroring which is useful for mission critical applications that also require fast read times, but it has a slower write time. If you are using 4 drives, it seems like a big waste.