How to split Seurat objec according to sample or condition

Thank you so much for your sharing,it has benefited me a lot. 
I have 10 samples in 2 condition, every conditon has 5 samples. So when to integrate data to analysis.,How to split?
Should I use the condition or the 10 sample in Seurat.
data.list <- SplitObject(data, split.by = "sample") or by condition.
Looking forward to your reply