Performance SSD 2 seperate drives vs RAID 0 vs 1 large drive

[HomerJS]

Looking at 3 choices

A. 1 256gb SSD, install OS and apps
B. 2 128gb SSDs in RAID0. Install OS and apps
C. 2 128gb SSDs. OS on 1st drive, apps on 2nd drive.

I know there are performance gains with RAID 0 (forget TRIM for now)

Is there some contention with OS/apps on same drive assuming when app starts a component of windows would start also?

Gonna put data on HHD

 

[Zap]

I personally would run choice A, if those were the only choices available to me and all else ($/GB, performance) were equal.