2005 Volvo XC90 V8

Just got this ride last week. Need to get oil and filters for it, to keep.
The previous owner uses Castrol Full Synthetic, 5W30.
Went to get oil, there were about six types of Castrol, in different color containers, Full Synthetic oil to choose from.
Please help. Which one should I use? I know it's 5w30 weight and full synthetic.